March 2018
Sunday Monday Tuesday Wednesday Thursday Friday Saturday

1

1. 11 am, Conference Room Bldg 815E

Hosted by: Laura Fierce

We examined the impact of condensing organic aerosols on activated cloud number concentration in a new aerosol microphysics model, MATRIX-VBS. The model, which can be used as a box model or a module in a global model, includes the volatilitybasis set (VBS) framework in an aerosol microphysical scheme MATRIX (Multiconfiguration Aerosol TRacker of mIXing state) that resolves aerosol mass and number concentrations and aerosol mixing state. Parameters such as aerosol chemical composition, mass and number concentrations, and particle sizes which affect activated cloud number concentration were thoroughly evaluated via a suite of Monte-Carlo simulations. Results from the box model show that by including the condensation of organic aerosols, under most conditions, the new model (MATRIX-VBS) has less activated particles compared to the original model (MATRIX), which treats organic aerosols as non-volatile. When implemented in the global model GISS ModelE as a module, we expect that the improved box model in the global scale would more accurately represent aerosol-cloud interactions. Thus it would offer us valuable insights on how the addition of organic partitioning would change cloud activation in the global atmosphere and its implications for climate.

2. 1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Hosted by: Igor Zaliznyak

We study the temperature dependence of the electrical resistivity in a system composed of critical spin chains interacting with three dimensional conduction electrons and driven to criticality via an external magnetic field. The relevant experimental system is Yb2Pt2Pb, a metal where itinerant electrons coexist with localized moments of Yb-ions which can be described in terms of effective S = 1/2 spins with dominantly one-dimensional exchange interaction. The spin subsystem becomes critical in a relatively weak magnetic field, where it behaves like a Luttinger liquid. We theoretically examine a Kondo lattice with different effective space dimensionalities of the two interacting sub-systems. We characterize the corresponding non-Fermi liquid behavior due to the "local criticality" from the spins by calculating the electronic relaxation rate and the dc resistivity and establish its quasi linear temperature dependence.

3. 4 pm, CFN, Bldg 735, Seminar Room, 2nd Floor

Hosted by: Matthew Sfeir

The emergence of two-dimensional (2D) monolayer transition metal dichalcogenides (ML-TMDC) as direct bandgap semiconductors has rapidly accelerated the advancement of room temperature, 2D optoelectronic devices. Optical excitations on the TMDCs manifest from a hierarchy of electrically tunable, Coulombic free-carrier and excitonic many-body phenomena. Investigating the fundamental interactions underpinning these phenomena presents challenges, however, due to a complex balance of competing optoelectronic effects and interdependent properties. We show how optical detection of bound- and free-carrier photoexcitations is used to directly quantify carrier-induced changes of the quasiparticle band gap and exciton binding energies [1]. Pushing to the nanoscale, we demonstrate that a model hybrid architecture, a nano-optical antenna and a ML-WSe2 nanobubble, activates the optical activity of BX states at room temperature and under ambient conditions. These results show that engineered bound-exciton functionality as, in this case, localized nanoscale light sources, can be enabled by an architectural motif that combines localized strain and a nano-optical antenna, laying out a possible path for realizing room-temperature single-photon sources in high-quality 2D semiconductors.

2

1. 12 pm, NSLS-II Bldg. 743 Rm 156

Hosted by: Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang

2. 12:15 pm, Building 510, Room 2-160

Hosted by: Christoph Lehner

3. 2 pm, Small Seminar Room, Bldg. 510

Hosted by: Chun Shen

It has long been known that sub-nucleonic fluctuations of the energy density in the initial stages of heavy ion collisions play an important role in generating the observed distributions of particles and their flow. These energy density fluctuations are dominated by the radiation of small-x gluons which are populated to classically large occupation numbers in the wave functions of ultra-relativistic heavy ions. While these soft gluons dominate the initial conditions for the energy density, it is quark production which determines the initial conditions of other conserved charges, like flavor and baryon number. With the recent development of state-of-the art hydrodynamics codes tailored to the Beam Energy Scan which can propagate these conserved charges into the final state, it is timely and important to calculate the initial conditions of these conserved charges from first principles in QCD. In this talk, I will present new results for the spatial correlations among quarks and antiquarks produced at mid-rapidity by pair production from small-x gluons. This single-pair production mechanism, which has been studied for some time in momentum space, is the leading contribution to these correlations in coordinate space for dilute-dense collisions. As one moves from the dilute-dense regime toward the dense-dense regime, correlations due to double pair production become more important, and these correlations persist over larger length scales than the single-pair production mechanism. Over nonperturbative length scales, only the correlations from the overlap geometry remain. I will present explicit results for quark-antiquark correlations due to single pair production, and I will outline some preliminary results for the various double-pair production mechanisms. The ultimate goal of this work will be to construct a code which can initialize these conserved charges over all length scales in heavy-ion collisions.

3

1. 8:30 am, Stony Brook University

The Girl Power in STEM: Press for Progress! symposium at Stony Brook University (SBU) on March 3, co-sponsored by Brookhaven Women in Science (BWIS), will celebrate the accomplishment of women in the Science, Technology, Engineering, and Math (STEM) fields. Lecturers and panelists, including many from Brookhaven Lab, will discuss the impact of women in STEM careers, on the work environment, and on the economy, and how society can improve women's participation in STEM fields. The event marks International Women's Day, proclaimed by the United Nations (UN) as a day to champion women's rights. This year the UN celebrates taking action to promote equal opportunities at all levels and to help forge a more gender inclusive world.

4

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5

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6

1. 11 am, Small Seminar Room, Bldg. 510

Hosted by: Jia Jiangyong

Upcoming beam energy scan (BES) phase II will explore the QCD phase diagram with an unprecedented precision and would potentially discover the QCD critical point. I will discuss recent theoretical developments aim at maximizing the discovery potential of BESII from both phenomenological and formal perspectives. First, I will discuss new observables which are very sensitive to the presence of the QCD critical point and are possible due to the iTPC upgrade. In the second part, I will report recent progress on understanding and describing hydrodynamic fluctuations. Remarkably, effects of hydrodynamic fluctuations can be potentially important for precise determination of shear viscosity at top RHIC energy and would play a crucial role near the QCD critical point.

2. 2:30 pm, Large Conference Room, Bldg. 535

At the Extreme Light Lab at the Air Force Research Laboratory, Dayton, we explore light matter interaction at relativistic fields with liquid targets. Although demonstrations of up to 4 GeV1 electrons and ~100 MeV protons2 have been achieved in the past, all of these are not feasible as future accelerators, due to their slow duty cycle (usually single shot, rarely 1 Hz). There are many challenges to increasing the duty cycle, where laser technology, target technology, damage to system, target alignment, high repetition rate sub-micron plasma diagnostics provides nearly insurmountable obstacles. In this program, we developed ways to accelerate MeV x-rays, electrons3 and ions4 at kHz repetition rate with a small milli-joule class laser system, by developing a combination of suitable laser system, diagnostic system, target system and experimental data collection system capable of handling the high duty cycle. We also perform femtosecond-time resolution pump-probe imaging of the interaction, and extensive large scale relativistic laser plasma interaction simulations5 that reveal the nature of the acceleration processes. Such a system opens the door to extensive future application as a source for materials processing, radiation hardness testing, medical isotope production, time resolved proton probing on relativistic interactions, and many others.

3. 3:30 pm, Large Seminar Room, Bldg. 510

Hosted by: Andrei Nomerotski

hile non-perturbative approaches such as lattice gauge theory led to significant advances in understanding the physics of strong interactions, many problems remain out of reach for classical computation, in particular, real-time dynamics or properties of QCD at finite baryon density that are being explored in heavy-ion collision experiments. Recent advances in the technology of engineering custom interactions for ultra-cold atomic gases in optical lattices opened a possibility for quantum simulations as was envisioned by R. Feynman in the 1980s. The main idea is that the degrees of freedom of the original system are mapped onto a quantum Hamiltonian whose dynamics can be realized in a laboratory. Many condensed matter Hamiltonians, such as Bose-Hubbard model, have been recently studied in this way. Quantum simulation of gauge theories is however challenging since the gauge symmetry is not naturally present in the ultra-cold atomic systems. I will review the current status of theoretical proposals for quantum simulation of field theories and then focus on our recent work on an explicitly gauge-invariant formulation of the Abelian-Higgs model for simulation on optical lattices.

7

1. 2 pm, Small Seminar Room, Bldg. 510

Hosted by: Christopher Murphy

8

1. 11 am, Conference Room Bldg 815E

Hosted by: Mike Jensen

Level of neutral buoyancy (LNB) is an important parameter for understanding convection because it sets the potential vertical extent for convective development. It can be estimated from the parcel theory using the ambient sounding without having to observe any actual convective cloud development. In reality, however, convection interacts with the environment in complicated ways; it will eventually find its own effective LNB and manifests it through detraining masses and developing cirrus anvils. In a series of recent papers, we investigated the relationship between the LNB and actual deep convective outflow using 5 years of CloudSat observations. Due to entrainment dilution, the actual outflow level is almost always lower than the LNB. The difference between the two can be interpreted as a proxy for entrainment rate. It was found that the entrainment rate as determined this way is larger over tropical ocean (e.g., TWP warm pool) than tropical land (e.g., Africa and Amazon). Analysis of radar reflectivity profiles further shows that land convection has wider and more intense cores than the oceanic counterpart. These findings lend observational support to a long-standing assumption in convection models concerning the negative relationship between entrainment rate and convective core size. Finally, we examined the environment conditions for the observed convection cases and found that convective outflow tends to occur at a higher level when the mid-troposphere is more humid and when convective system size is smaller. Application of similar analysis to ground-based radar observations (such as those from the DOE ARM program) will be discussed. ?

2. 3 pm, Small Seminar Room, Bldg. 510

Hosted by: Chao Zhang

The NOvA experiment is an off-axis long-baseline neutrino oscillation experiment using the NuMI $\nu_{\mu}$ beam originating at Fermilab. By examining the disappearance of muon neutrinos and the appearance of electron neutrinos between the near detector at Fermilab and the far detector in Ash River, MN, NOvA has the potential to help answer a number of fundamental questions: Are the neutrinos' masses ordered the same way as those of the charged leptons? Do leptons experience charge-parity violation? Are there underlying symmetries in the way the neutrino states mix with one another? In this talk I will present NOvA's most recent constraints on the answers to those questions utilizing muon neutrino disappearance and electron neutrino appearance. These updated results are based on a 50% increase in exposure relative to previous results as well as numerous simulation and analysis improvements.

3. 4 pm, Small Seminar Room, Bldg. 510

Hosted by: Andrey Tarasov

We consider cos(phi) and cos(2phi) modulations in SIDIS and Drell-Yan cross-sections and perform resummation of large perturbative logarithms to all orders. We show consistency of high qT tails of these modulations with existing perturbative calculations.

4. 6:30 pm, Berkner Hall, Room B

9

1. 12 pm, NSLS-II Bldg. 743 Room 156

Hosted by: Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang

2. 12:15 pm, Building 510, Room 2-160

3. 2 pm, Small Seminar Room, Bldg. 510

Hosted by: Chun Shen

The MHV action is the Yang-Mills action quantized on the light-front, where the two explicit physical gluonic degrees of freedom have been canonically transformed to a new set of fields. This transformation leads to the action with vertices being off-shell continuations of the MHV amplitudes. We show that the solution to the field transformation expressing one of the new fields in terms of the Yang-Mills field is a certain type of the Wilson line. More precisely, it is a straight infinite gauge link with a slope extending to the light-cone minus and the transverse direction. One of the consequences of that fact is that certain MHV vertices reduced partially on-shell are gauge invariant — a fact discovered before using conventional light-front perturbation theory. We also analyze the diagrammatic content of the field transformations leading to the MHV action. We found that the diagrams for the solution to the transformation (given by the Wilson line) and its inverse differ only by light-front energy denominators.

10

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12

1. 12 pm, Berkner Hall, Room B

Hosted by: Ruth Comas

We hope you can all join us on Monday for our first lunchtime mediation session as a BERA group. The format is uninstructed except for the guided meditation recordings we will be using. These informal gatherings will be in addition to the 3/26, 4/23, 5/21 and 6/25 dates that will be have professional guidance for Mindfulness Meditation

2. 3 pm, Small Seminar Room, Bldg. 510

Hosted by: Alessandro Tricoli

The LHC experiments require huge, ever-increasing volumes of data to explore the frontiers of particle physics, and the grid provides the infrastructure to meet this challenge. Today, even medium sized experiments produce petabytes of data that need to be analysed by international collaborations and the relationship between particle physicists and their data has had to evolve to keep pace. Calibrating and systematically understanding detectors requires detailed information, deep learning algorithms promise to allow us to fully exploit our experiments, and on the other hand we want to analyse our data quickly and be the first to publish. This talk will first describe how, shortly after the Higgs discovery, ATLAS realised that the way that analysis was done had to change, and will briefly illustrate what those changes entailed. Next, the NA62 experiment will be described. Recording a billion events per day, NA62 aims to measure the very rare decay of a charged kaon to a charged pion and two neutrinos. The collaboration had to quickly implement petabyte scale data processing infrastructure to perform the sub-nanosecond calibrations needed to challenge the 10% precision of the theory prediction.

13

1. No events scheduled

14

1. 2 am, CFN, Bldg. 735 - first, floor, conference room A

Hosted by: Mingzhao Liu

Solar radiation is a vast, distributed, and renewable energy source which Humanity can utilize via the photovoltaic effect. The goal of photovoltaic technology is to minimize the true costs, while maximizing the power conversion efficiency and lifetime of the cell/module. Interface-related approaches to achieving this goal are explored here, for two technologically-important classes of light absorbers: crystalline-silicon (c-Si) and metal halide perovskite (MHP). The simplest solar cell consists of a light absorber, sandwiched between two metals with dissimilar work functions. Carrier-selective contacts (CSC's), which are ubiquitous in modern solar cells, are added to improve the electrical performance. Solar cells require asymmetric carrier transport within the cell, which can be effected via electrostatic and/or effective fields, and CSC's augment the asymmetry by selectively transporting holes to one contact, and electrons to the other contact. The proper design and implementation of a CSC is crucial, as the performance, lifetime, and/or cost reduction of a solar cell can be hampered by a single interface or layer. A framework, consisting of eight core requirements, was developed from first-principles to evaluate the effectiveness of a given CSC. The framework includes some requirements which are well-recognized, such as the need for appropriate band offsets, and some requirements which are not well-recognized at the moment, such as the need for effective valence/conduction band density of states matching between the absorber and CSC. The application of the framework to multiple silicon-based and MHP-based CSC's revealed the difficulties of effectively designing and implementing a CSC. Three metal oxide/c-Si heterojunctions initially expected to yield comparable electron-selective contacts (ESC's), titanium dioxide/c-Si (TiO2/c-Si), zinc oxide/c-Si (ZnO/c-Si), and tin dioxide/c-Si (SnO2/c-Si), were instead discovered to be widely diff

2. 10 am, Recreation Hall, Bldg. 317

Hosted by: QOL/BERA/Recreation

Enjoy coffee and meeting others, and if you have kids, they'll play.

15

1. 11 am, ISB Bldg. 734 Seminar Room 201 (upstairs)

Hosted by: Mark Dean

5d transition metal oxides have emerged as a novel playground for some of the most outstanding and challenging problems in condensed matter physics, such as metal-insulator transition and quantum magnetism. In particular, layered iridates hosting square lattices of IrO6 octahedra have drawn significant interests due to the electronic and magnetic analogy with high-Tc cuprates. However, materials of this kind are limited to a few Ruddlesden-Popper (RP) compounds. In this talk, I will discuss our recent work on overcoming this bottleneck by constructing such two-dimensional (2D) structures confined in superlattices grown by heteroepitaxy. By leveraging the layering control of epitaxial growth, we are not only able to develop new structural variants of layered iridates, but also unravel and exploit the intriguing spin-orbit-driven 2D magnetism beyond the cuprate physics yet invisible in the RP iridates. The results demonstrate the power of this approach in tailing the exchange interactions, enabling new magnetic controls, and providing unique insights into the emergent phenomena of 5d electrons.

2. 11:30 am, Conference Room Bldg 815E

Hosted by: Janek Uin

A parallel electrical aerosol spectrometer is essentially a differential mobility analyzer with many output sections and measurement channels. Instead of varying the analyzer voltage to scan over a range of particle mobilities, the whole distribution is captured at once. The principle is used by the Neutral cluster and Air Ion spectrometer (NAIS) to measure ions in the size range from 0.8 nm to 40 nm and neutral particles from 2 nm to 40 nm. The instrument is used in many places around the world, from polluted downtowns to jungles and mountain tops, to study new particle formation and other aerosol phenomena. The talk will give an overview of the principles and designs of the NAIS and other aerosol instrumentation developed at the University of Tartu and the spin-off company Airel Ltd.

3. 12:30 pm, Building 510, Room 2-160

4. 1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Hosted by: Robert Konik

We obtain a controlled description of a strongly correlated regime of electronic behaviour. We argue that there are two ways to characterise the electronic degree of freedom, either by the canonical fermion algebra or by the graded Lie algebra su(2|2). The first underlies the Fermi liquid description of correlated matter, and we identify a novel regime governed by the latter. We obtain the electronic spectral function within a controlled approximation, and find a splitting in two of the electronic band. The Luttinger sum rule is violated and a Mott metal-insulator transition is exhibited.

5. 3 pm, Small Seminar Room, Bldg. 510

Hosted by: Chao Zhang

Precision measurements of various asymmetries in neutron decay permit an extraction of the weak axial-vector coupling constant, gA, a fundamental quantity important for weak-interaction physics and as a benchmark for lattice QCD calculations. I will discuss a recent new result from the UCNA Experiment at Los Alamos National Laboratory for a 0.16% precision result on gA from a measurement of the 'A' asymmetry, which represents the parity-violating angular correlation between the neutron's spin and the decay electron's momentum. This long-standing effort was carried out with a superconducting solenoidal electron spectrometer at the LANL Ultracold Neutron (UCN) facility. This new result will be placed in the context of historical results for gA and recent discrepant values for the neutron lifetime obtained via different experimental techniques. I will also discuss the first-ever extraction of the Fierz interference term 'b' in free neutron decay from an analysis of the electron's spectral shape as measured in the UCNA Experiment. A non-zero 'b' term would result from beyond-Standard Model interactions, such as Scalar or Tensor physics. Although the result for 'b' from the UCNA Experiment was systematics limited, it points to the requisite significant improvements in the characterization of the detector energy response that future experiments aimed at a measurement of 'b' will need to achieve in order to probe beyond Standard Model physics at a competitive precision.

16

1. 12:15 pm, Building 510, Room 2-160

Hosted by: Christoph Lehner

2. 1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Hosted by: Robert Konik

In this talk we review the slave boson meanfield formulation of the fermion+boson quantum dimer model for the pseudogap phase of the high temperature superconductors. We show that in the presence of weak slowly varying external magnetic and electric fields the fermionic dimers undergo semiclassical motion in the external field. As a result in the presence of magnetic fields strong enough to destroy superconductivity the dimers undergo quantum oscillations. Indeed they satisfy Onsager quantization for their orbits and Lifshtiz-Kosevich formula for the amplitude of oscillations. We also compute the effective charges of the dimers in the presence of external magnetic fields as a function of temperature. We show that the effective magnetic charge changes sign from negative −e at low temperature to positive +e at high temperature. This leads to a change of the sign of the Hall coeÿcient as a function of temperature. We also compute the magnetoresistance as a function of the external field and temperature within a linearized Boltzmann equation approximation for the fermionic dimers. Furthermore we further show that the dimers undergo a Lifshitz transition as a function of doping with a van Hove singularity appearing at the Fermi surface near optimal doping ∼ 20%. Indeed the van Hove singularity leads to a divergence of the density of states and as such an optimum Tc. We study the interplay of nematic fluctuations and the van Hove singularity both of which occur near optimal doping. We show that the van Hove singularity modifies the critical properties of the QCP (quantum critical point) for nematic fluctuations and that the QCP may be described by Hertz Millis like theory with z = 4. This allows us to calculate the critical exponents of the nematic fluctuations and to show that the fermionic dimers have non-Fermi liquid behavior near the QCP with the self energy diverging ∼ |ω3/4| near the QCP.

3. 2 pm, Small Seminar Room, Bldg. 510

Hosted by: Andrey Tarasov

It is well known that BFKL gives anomalous dimensions of twist-2 operators of spin j in the "BFKL limit'' $g^2\righarrow 0,\omega\equiv j-1\righarrow 0,{g^2\over\omega}$ fixed. I demonstrate that such limit describes the non-local light-ray operators and present the results of calculation of two- and three-point correlation functions of these operators in this limit. The calculation is performed in ${\cal N}$=4 SYM but the result is valid in other gauge theories such as QCD.

17

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18

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19

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20

1. MAR

20

Tuesday

11 am, Small Seminar Room, Bldg. 510

Tuesday, March 20, 2018, 11:00 am

Hosted by: Lijuan Ruan

Recent years, evidence for collective effects has been revealed in pp and pPb collisions when looking at events releasing large number of particles. The experimental observations lead to a debate of the formation of strongly coupled Quark-Gluon Plasma in those small collision systems. Azimuthal anisotropy coefficient (vn) of heavy-flavor particles, and especially the comparison to light flavor particles vn, can shed light on the strength of the coupling between heavy flavor quarks and the hypothesized hydrodynamic medium at a significantly reduces size, and impose further constrains on different interpretations related to the origin of the observed collectivity. In this talk, the most recent results of prompt D0 meson elliptic flow (v2) in high-multiplicity pPb collisions are presented over a wide transverse momentum range. The results are compared to those of strange hadrons, including Kshort, Lambda, Cascade and Omega particles.

2. MAR

20

Tuesday

2 pm, Building 480 Conference Room

Tuesday, March 20, 2018, 2:00 pm

Hosted by: Yimei Zhu

Recent-generation TEM/STEM instruments fitted with an electron monochromator provide an energy resolution down to 0.01 eV for electron energy-loss spectroscopy (EELS) and are themselves capable of achieving a spatial resolution approaching 0.1 nm. Besides offering the possibility of vibrational-mode EELS for examining chemical bonds, these instruments could be useful for mapping the electronic properties (e.g. band gap) of insulators and semiconductors. However, basic physics imposes a spatial resolution of few nm (or tens of nm) for energy loss below 10 eV, due to delocalization of the inelastic scattering. We will discuss what might be done to improve the spatial resolution, to make low-loss EELS competitive with other techniques.

3. MAR

20

Tuesday

3:30 pm, Large Seminar Room, Bldg. 510

Tuesday, March 20, 2018, 3:30 pm

Hosted by: Peter Petreczky

This is an introduction to how atomic nuclei and other quantum few- and many-body systems can be studied using lattice simulations. The first part of the talk explains the basic formalism called lattice effective field theory. The rest of the talk is a discussion of novel methods and the new physics insights one gains with each. The methods discussed are the adiabatic projection method for scattering and reaction calculations, pinhole algorithm for probing structure and thermodynamic properties, and eigenvector continuation for extending calculations to regions of parameter space where things otherwise break down.

21

1. MAR

21

Wednesday

2 pm, Small Seminar Room, Bldg. 510

Wednesday, March 21, 2018, 2:00 pm

Hosted by: Christopher Murphy

22

1. MAR

22

Thursday

1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Thursday, March 22, 2018, 1:30 pm

Hosted by: Robert Konik

Resonant inelastic x-ray scattering (RIXS) is a relatively new technique for probing low energy excitations in materials. In addition to traditional techniques, such as angle resolved photoemission, it has become an important, high precision characterization tool of strongly correlated electron materials. To calculate RIXS, and related core and valence level spectra, we solve the Bethe-Salpeter equation (BSE) based on a self-energy corrected density functional theory electronic structure. I outline our implementation of the BSE and use SrVO3 for demonstration. The sensitivity of spectral features to the self-energy approximation – whether G0W0, qpscGW, or DMFT – is highlighted. To include interactions beyond the usual BSE I introduce the cumulant expansion. Spectral functions derived from a GW self-energy are typically inadequate when the dressed Green's function is built via the Dyson equation. With the same GW self-energy, a superior Green's function and spectral function, implicitly including vertex corrections, is obtained through the cumulant expansion. I consider application of the GW-cumulant expansion to photoemission, photoabsorption, and X-ray scattering. Lastly, vibronic coupling has important impacts on these spectra. I show how to calculation the phonon contribution to photoemission, absorption and scattering with a vibronic cumulant.

2. MAR

22

Thursday

4 pm, Large Seminar Room, Bldg. 510

Thursday, March 22, 2018, 4:00 pm

Edward Sierra will provide a talk on Marie Curie, an extraordinary scientist, the first woman to win a Nobel Prize, and still the only one awarded with two Nobel Prizes. Ed's interest in the early pioneers of radioactivity was piqued by the discussions he had many years ago with the renowned Dr. Maurice Goldhaber, the prominent physicist and a former Laboratory Director at Brookhaven National Laboratory. He learned that Goldhaber was a student under Sir James Chadwick at the Cavendish Laboratory at Cambridge University and that he attended a graduate course in Berlin given by Dr. Lise Meitner. Ed's research on Meitner led to an interest in Marie Curie. Her work and life is the topic of this talk.

23

1. MAR

23

Friday

12:15 pm, Building 510, Room - 2-160

Friday, March 23, 2018, 12:15 pm

24

1. No events scheduled

25

1. No events scheduled

26

1. No events scheduled

27

1. MAR

27

Tuesday

7 pm, Napper Tandy's 60 E. Main Street Bay Shore, N

Tuesday, March 27, 2018, 7:00 pm

28

1. No events scheduled

29

1. MAR

29

Thursday

1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Thursday, March 29, 2018, 1:30 pm

Hosted by: Igor Zaliznyak

TBD

30

1. No events scheduled

31

1. No events scheduled

1. MAR

20

Tuesday

Nuclear Physics Seminar

"Probing the collectivity of heavy quarks in pPb collisions with prompt D0 elliptic flow using CMS detector"

Presented by Zhenyu Chen, Rice University

11 am, Small Seminar Room, Bldg. 510

Tuesday, March 20, 2018, 11:00 am

Hosted by: Lijuan Ruan

Recent years, evidence for collective effects has been revealed in pp and pPb collisions when looking at events releasing large number of particles. The experimental observations lead to a debate of the formation of strongly coupled Quark-Gluon Plasma in those small collision systems. Azimuthal anisotropy coefficient (vn) of heavy-flavor particles, and especially the comparison to light flavor particles vn, can shed light on the strength of the coupling between heavy flavor quarks and the hypothesized hydrodynamic medium at a significantly reduces size, and impose further constrains on different interpretations related to the origin of the observed collectivity. In this talk, the most recent results of prompt D0 meson elliptic flow (v2) in high-multiplicity pPb collisions are presented over a wide transverse momentum range. The results are compared to those of strange hadrons, including Kshort, Lambda, Cascade and Omega particles.

2. MAR

20

Tuesday

Condensed-Matter Physics & Materials Science Seminar

"Spatial Resolution of Low-Loss EELS"

Presented by R.F. Egerton, University of Alberta, Canada

2 pm, Building 480 Conference Room

Tuesday, March 20, 2018, 2:00 pm

Hosted by: Yimei Zhu

Recent-generation TEM/STEM instruments fitted with an electron monochromator provide an energy resolution down to 0.01 eV for electron energy-loss spectroscopy (EELS) and are themselves capable of achieving a spatial resolution approaching 0.1 nm. Besides offering the possibility of vibrational-mode EELS for examining chemical bonds, these instruments could be useful for mapping the electronic properties (e.g. band gap) of insulators and semiconductors. However, basic physics imposes a spatial resolution of few nm (or tens of nm) for energy loss below 10 eV, due to delocalization of the inelastic scattering. We will discuss what might be done to improve the spatial resolution, to make low-loss EELS competitive with other techniques.

3. MAR

20

Tuesday

Physics Colloquium

"Nuclear lattice simulations"

Presented by Dean Lee, Michigan State University

3:30 pm, Large Seminar Room, Bldg. 510

Tuesday, March 20, 2018, 3:30 pm

Hosted by: Peter Petreczky

This is an introduction to how atomic nuclei and other quantum few- and many-body systems can be studied using lattice simulations. The first part of the talk explains the basic formalism called lattice effective field theory. The rest of the talk is a discussion of novel methods and the new physics insights one gains with each. The methods discussed are the adiabatic projection method for scattering and reaction calculations, pinhole algorithm for probing structure and thermodynamic properties, and eigenvector continuation for extending calculations to regions of parameter space where things otherwise break down.

4. MAR

21

Wednesday

HET Seminar

"Empirical Determination of Dark Matter Velocities"

Presented by Lina Necib, Caltech

2 pm, Small Seminar Room, Bldg. 510

Wednesday, March 21, 2018, 2:00 pm

Hosted by: Christopher Murphy

5. MAR

22

Thursday

Condensed-Matter Physics & Materials Science Seminar

"Accurate spectral calculations for testing electronic structures, low energy excitations, and vibronic interactions"

Presented by Keith Gilmore, The European Synchrotron Radiation Facility, France

1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Thursday, March 22, 2018, 1:30 pm

Hosted by: Robert Konik

Resonant inelastic x-ray scattering (RIXS) is a relatively new technique for probing low energy excitations in materials. In addition to traditional techniques, such as angle resolved photoemission, it has become an important, high precision characterization tool of strongly correlated electron materials. To calculate RIXS, and related core and valence level spectra, we solve the Bethe-Salpeter equation (BSE) based on a self-energy corrected density functional theory electronic structure. I outline our implementation of the BSE and use SrVO3 for demonstration. The sensitivity of spectral features to the self-energy approximation – whether G0W0, qpscGW, or DMFT – is highlighted. To include interactions beyond the usual BSE I introduce the cumulant expansion. Spectral functions derived from a GW self-energy are typically inadequate when the dressed Green's function is built via the Dyson equation. With the same GW self-energy, a superior Green's function and spectral function, implicitly including vertex corrections, is obtained through the cumulant expansion. I consider application of the GW-cumulant expansion to photoemission, photoabsorption, and X-ray scattering. Lastly, vibronic coupling has important impacts on these spectra. I show how to calculation the phonon contribution to photoemission, absorption and scattering with a vibronic cumulant.

6. MAR

22

Thursday

BWIS Lecture

"Madame Curie's Life and Work"

Presented by Edward Sierra, BNL Quality Management Office

4 pm, Large Seminar Room, Bldg. 510

Thursday, March 22, 2018, 4:00 pm

Edward Sierra will provide a talk on Marie Curie, an extraordinary scientist, the first woman to win a Nobel Prize, and still the only one awarded with two Nobel Prizes. Ed's interest in the early pioneers of radioactivity was piqued by the discussions he had many years ago with the renowned Dr. Maurice Goldhaber, the prominent physicist and a former Laboratory Director at Brookhaven National Laboratory. He learned that Goldhaber was a student under Sir James Chadwick at the Cavendish Laboratory at Cambridge University and that he attended a graduate course in Berlin given by Dr. Lise Meitner. Ed's research on Meitner led to an interest in Marie Curie. Her work and life is the topic of this talk.

7. MAR

23

Friday

HET Lunch Discussion /Neutrino Discovery Initative

"Boosted Dark Matter at DUNE"

Presented by Lina Necib, Caltech

12:15 pm, Building 510, Room - 2-160

Friday, March 23, 2018, 12:15 pm

8. MAR

27

Tuesday

PubSci

"PubSci: Nuclear Medicine for Personalized Cancer Treatment"

7 pm, Napper Tandy's 60 E. Main Street Bay Shore, N

Tuesday, March 27, 2018, 7:00 pm

9. MAR

29

Thursday

Condensed-Matter Physics & Materials Science Seminar

"TBD"

Presented by Andreas Weichselbaum, Brookhaven National Lab

1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Thursday, March 29, 2018, 1:30 pm

Hosted by: Igor Zaliznyak

TBD

10. APR

3

Tuesday

Physics Colloquium

"Eigenstate thermalization and its implications to statistical mechanics"

Presented by Anatoli Polkovnikov, Boston University

3:30 pm, Large Seminar Room, Bldg. 510

Tuesday, April 3, 2018, 3:30 pm

Hosted by: Rob Pisarski

In this talk I will overview recent developments in understanding quantum chaos through random matrix theory. I will discuss various conjectures on the nature of quantum stationary states in chaotic systems and show numerical evidence supporting them. It is the random nature of eigenstates, which ultimately leads to loss of information about initial conditions and leads to emergence of statistical mechanics in isolated systems. I will then introduce the so-called Eigenstate Thermalization Hypothesis (ETH) ansatz first proposed by J. Deutsch and M. Srednicki in 90th, which gives a unified framework for the structure of physical observable in quantum chaotic systems. I will demonstrate how the ETH ansatz naturally leads to emergence of various thermodynamic relations. At the end of the talk I will mention some open problems.

11. APR

4

Wednesday

HET Seminar

"TBA"

Presented by Katelin Schutz, UC Berkeley

2 pm, Small Seminar Room, Bldg. 510

Wednesday, April 4, 2018, 2:00 pm

Hosted by: Christopher Murphy

12. APR

4

Wednesday

Computational Science Initiative Event

"The Exascale Computing Project: Status and Next Steps"

Presented by Dr. Doug Kothe and Stephen Lee, ORNL/LANL

2:30 pm, Seminar Room, Bldg. 725

Wednesday, April 4, 2018, 2:30 pm

Hosted by: Kerstin Kleese van Dam

The Exascale Computing Project (ECP) is focused on accelerating the delivery of a capable exascale computing ecosystem to provide breakthrough solutions that can address our most critical challenges in scientific discovery, energy assurance, economic competitiveness, and national security. ECP is a joint effort of two DOE organizations: the Office of Science (SC) and the National Nuclear Security Administration (NNSA). In this context, "capable" means that a wide range of applications will be able to use the systems developed through ECP, ensuring that both science and security needs will be addressed. The term "ecosystem" shows that the goal is not just more powerful machines, but all of the methods and tools needed to ensure effective use of the ECP-enabled exascale systems to be acquired by DOE national laboratories. Current plans call for delivery of the first exascale system to Argonne National Laboratory in 2021, with additional exascale systems to follow at other SC and NNSA laboratories over the next several years to meet identified mission needs. ECP's work encompasses the development of applications, software technologies, and hardware technologies and architectures. This work is carried out by teams that leverage the diverse capabilities of the national laboratories (such as Brookhaven National Laboratory), universities, and industry. These teams are presently delivering advances in all three of these focus areas. A brief overview of the goals and scope of the ECP will be given along with highlights of recent R&D activities, deliverables (milestones), and accomplishments for each of the three focus areas. Near term plans will also be addressed, including the technical challenges foreseen on the horizon.

13. APR

4

Wednesday

CFN Colloquium

""Soft matter design and characterization in the era of machine learning""

Presented by Juan J. de Pablo, University of Chicago

4 pm, Bldg 735, CFN Seminar Room 2nd Floor

Wednesday, April 4, 2018, 4:00 pm

Hosted by: Matthew Sfeir

The advent of innovative molecular modeling algorithms, optimization strategies, and machine learning techniques is ushering a new era of materials science and engineering in which computational tools are routinely used to probe, design, and interrogate matter and functional materials systems. In this presentation I will illustrate some of these ideas in the context of a variety of examples taken from chemical engineering, physics, biology and materials science. In the first, I will discuss the simultaneous interpretation of scattering data from multiple sources by relying on molecular models. In the second I will present models of biological systems that use machine learning to integrate experimental and computational information form a wide range of sources. In the third, I will discuss how evolutionary optimization and machine learning can be used to create new mechanical metamaterials.

14. APR

5

Thursday

Condensed-Matter Physics & Materials Science Seminar

"TBA"

Presented by Bin Chen, Director, Shanghai Laboratory of HPSTAR, China

1:30 pm, ISB Bldg. 734 Seminar Room 201 (upstairs)

Thursday, April 5, 2018, 1:30 pm

Hosted by: Cedomir Petrovic

15. APR

5

Thursday

Particle Physics Seminar

"Time for High Luminosity – a new Detector for ATLAS"

Presented by Joern Lange, Institut de Fisica d'Altes Energies (IFAE) Barcelona

3 pm, Small Seminar Room, Bldg. 510

Thursday, April 5, 2018, 3:00 pm

Hosted by: Alessandro Tricoli

16. APR

5

Thursday

Particle Physics Seminar

"Low Gain Avalanche Diodes and their applciations"

Presented by Joern Lange, CNM/IFAE

3 pm, Small Seminar Room, Bldg. 510

Thursday, April 5, 2018, 3:00 pm

Hosted by: Alessandro Tricoli

17. APR

6

Friday

Nuclear Theory/RIKEN Seminar

"TBA"

Presented by Andreas Schmitt, University of Southampton

2 pm, Small Seminar Room, Bldg. 510

Friday, April 6, 2018, 2:00 pm

Hosted by: Chun Shen

18. APR

9

Monday

Joint HEP/NT Special Seminar

"TBA"

Presented by Yan-Qing Ma, Peking University

2 pm, Small Seminar Room, Bldg. 510

Monday, April 9, 2018, 2:00 pm

Hosted by: Chun Shen

19. APR

12

Thursday

NSLS-II Colloquium Series

"Sustainable chemical energy storage: critiques and crystallography"

Presented by William (Bill) David, University of Oxford, United Kingdom

4 pm, Physics Bldg. 510 Large Seminar Room

Thursday, April 12, 2018, 4:00 pm

Hosted by: John Hill

Our increasing dependence on intermittent renewable energy production places a greater focus on the development of novel, affordable energy storage. The recent emphasis on electrochemical storage, and on lithium batteries in particular, addresses a significant component of our future energy storage requirements but future low-carbon energy scenarios must utilise a broad range of storage options. This talk will focus on several examples the underline the role that synchrotron X-ray and neutron powder diffraction can play in the understanding of both electrochemical and chemical energy storage systems.

20. APR

12

Thursday

6:30 pm, Berkner Hall, Room B

Thursday, April 12, 2018, 6:30 pm

21. APR

17

Tuesday

Physics Colloquium

"Plasma science - From laboratory-fusion to astrophysical plasmas"

Presented by Fatima Ebrahimi, Princeton Plasma Physics Laboratory and Princeton University

3:30 pm, Large Seminar Room, Bldg. 510

Tuesday, April 17, 2018, 3:30 pm

Hosted by: Rob Pisarski

Our universe is immersed in magnetized plasma, electrically conducting ionized gas. Some of the most fundamental and long-standing astrophysical problems, such as the magnetization of the universe, collimation of astrophysical jets, the accretion process and transport in astrophysical disks (surrounding e.g. black holes) and their coronas can only be explored through plasma physics. Our sun as a natural laboratory for plasma physics provides inspiring as well as challenging problems, including its dynamo cycles, heating, and the replication of its core reaction, fusion energy, on earth in a lab. There is an abundance of observational/experimental data emerging from natural phenomena of space and astrophysical plasmas, as well as laboratory plasma experiments, for plasma physicists to explore. I will review some of these topics, in particular magnetic reconnection, the rearrangement of the magnetic ?field topology of plasmas, which energizes many processes in nature and has been shown to also be critical in the nonlinear dynamics of many processes in toroidal fusion plasmas. Using global simulations, I will demonstrate the instrumental role of magnetic reconnection, which enables an innovative technique for producing current in fusion plasmas.

22. APR

18

Wednesday

Joint BNL/SBU HET seminar

"TBA"

Presented by Csaba Csaki, Cornell University

2:30 pm, YITP

Wednesday, April 18, 2018, 2:30 pm

Hosted by: Christopher Murphy

23. APR

25

Wednesday

Office of Educational Programs Event

"2018 DOE/ BNL Spring Internship Poster Session"

1 pm, Berkner Hall Auditorium

Wednesday, April 25, 2018, 1:00 pm

Hosted by: Melvyn Morris

24. APR

25

Wednesday

Joint BNL/SBU HET Seminar

"TBA"

Presented by Matthew Buckley, Rutgers University

2 pm, Small Seminar Room, Bldg. 510

Wednesday, April 25, 2018, 2:00 pm

Hosted by: Christopher Murphy

25. APR

27

Friday

Center for Functional Nanomaterials Seminar

"Electrocatalysis: From nanoelectrochemistry to materials design"

Presented by Professor Dr. Wolfgang Schuhmann, Ruhr-Universität Bochum, Analytical Chemistry and Center for Electrochemical Sciences (CES), Germany

11 am, Bldg 735, CFN, Seminar Room 2nd Floor

Friday, April 27, 2018, 11:00 am

Hosted by: Huolin Xin

26. MAY

5

Saturday

Office of Educational Programs Event

"Science Fair"

8 am, Berkner Hall Cafeteria

Saturday, May 5, 2018, 8:00 am

27. MAY

7

Monday

Environmental & Climate Sciences Department Seminar

"Properties of the lightening activity in deep convective clouds"

Presented by Eric Defer, CNRS-Institute National des Sciences de'l Univers (INS), France

11 am, Conference Room Bldg 815E

Monday, May 7, 2018, 11:00 am

Hosted by: Mike Jensen

[pending]

28. MAY

10

Thursday

Community Advisory Council Meeting

6:30 pm, Berkner Hall, Room B

Thursday, May 10, 2018, 6:30 pm

29. MAY

14

Monday

Condensed-Matter Physics & Materials Science Seminar

"Superconductivity and quantum paraelectric fluctuations in STO"

Presented by Alexander Balatsky, Los Alamos National Laboratory

1:30 pm, ISB Bldg. 734 Conf. Rm. 201 (upstairs)

Monday, May 14, 2018, 1:30 pm

Hosted by: Laura Classen

STO is one of the earliest examples of superconductivity in oxides. With the pioneering discovery of the superconductivity in STO interfaces the field of emergent states at interfaces has been rapidly growing. Recently we come to realize that the key to a lot of puzzles in these devices lies in the complicated states of bulk STO[1,2]. Superconducting state is STO exhibits the dome as a function of doping. STO is also a known quantum paraelectric. Historically ferroelectric quantum criticality and superconducting dome in STO were assumed to be unrelated. We propose that they are in fact closely connected. We suggest that ferroelectric quantum criticality can induce superconductivity. We will present our results on investigation of the origin of superconductivity in doped STO using a combination of density functional and strong coupling theory[3]. Our approach suggests a model in which the ferroelectric soft mode fluctuations provide the pairing interaction for superconductivity carriers. This approach adds to the range of superconducting states induced by quantum criticality beyond magnetic and valence fluctuations[3,4,5]. Based on this model we made a prediction that superconducting Tc will increase with increasing 18O isotope substitution, a scenario that is experimentally verifiable[6]. We also discuss proposal to use strain as another tool to control paraelectric fluctuations and thus control superconductivity in STO[7]. We will illustrate the ongoing debate on the nature of the pairing states in bulk STO and in related heterostructure devices: the possibility to realize composite pairing states and multiband superconductivity[8]. [1]J. Haraldsen et al., Phys. Rev. B 84, 020103(R) (2011), [2]J. Haraldsen et al., Phys. Rev. B 85, 134501 (2012), [3]J. Edge et al Phys. Rev. Lett. 115, 247002 (2015), [4] Y. Kedem et.al, Physical Review B 93 , 184507 (2016), [5] CW Rischau et al, Nature Physics, 13, 643–648 (2017) [6] A. Stucky, et.al, Sci

30. MAY

16

Wednesday

HET Seminar

"TBA"

Presented by Anastassios Vladikas, INFN Roma Tor Vergata

2 pm, Small Seminar Room, Bldg. 510

Wednesday, May 16, 2018, 2:00 pm

Hosted by: Mattia Bruno

31. MAY

23

Wednesday

HET Seminar

"TBA"

Presented by Stefan Prestel, Fermilab

2 pm, Small Seminar Room, Bldg. 510

Wednesday, May 23, 2018, 2:00 pm

Hosted by: Christopher Murphy

32. MAY

25

Friday

Nuclear Theory/RIKEN Seminar

"TBA"

Presented by Stanley Brodsky, Standford Univeristy

2 pm, Small Seminar Room, Bldg. 510

Friday, May 25, 2018, 2:00 pm

33. MAY

30

Wednesday

Office of Educational Programs Event

"Open Space Stewardship Program Celebration"

6 pm, Berkner Hall Auditorium

Wednesday, May 30, 2018, 6:00 pm

Hosted by: Melvyn Morris

34. JUN

4

Monday

Office of Educational Programs Event

"2018 DOE/BNL Summer Internship Orientation"

8 am, Berkner Hall Auditorium

Monday, June 4, 2018, 8:00 am

Hosted by: Noel Blackburn

35. JUN

12

Tuesday

2018 RHIC/AGS Annual Users Meeting

8:30 am, Bldgs. 510, 555, 488

Tuesday, June 12, 2018, 8:30 am

Hosted by: Berndt Mueller

36. JUN

13

Wednesday

2018 RHIC/AGS Annual Users Meeting

8:30 am, Bldgs. 510,555,488

Wednesday, June 13, 2018, 8:30 am

Hosted by: Berndt Mueller

37. JUN

14

Thursday

2018 RHIC/AGS Annual Users Meeting

9 am, Berkner Hall Auditorium

Thursday, June 14, 2018, 9:00 am

38. JUN

14

Thursday

6:30 pm, Berkner Hall, Room B

Thursday, June 14, 2018, 6:30 pm

39. JUN

15

Friday

2018 RHIC/AGS Annual Users Meeting

9 am, Large Seminar Room, Bldg. 510

Friday, June 15, 2018, 9:00 am

Hosted by: Berndt Mueller

40. JUL

9

Monday

Office of Educational Programs Event

"High School Research Program Begins"

8 am, Berkner Hall Auditorium

Monday, July 9, 2018, 8:00 am

Hosted by: Aleida Perez

41. AUG

8

Wednesday

Office of Educational Programs Event

"2018 DOE/BNL Summer Internship Poster Session"

8:30 am, Berkner Hall Auditorium

Wednesday, August 8, 2018, 8:30 am

Hosted by: Noel Blackburn