1. NSLS-II Friday Lunchtime Seminar

   "Reversible Room-Temperature Fluoride-Ion Insertion in a Tunnel-Structured Transition Metal Oxide Host"

   Presented by Wasif Zaheer, Texas A&M University, TX

   Friday, September 18, 2020, 12 pm
   ZoomGov

   Hosted by: Ignace Jarrige

   An energy storage paradigm orthogonal to Li-ion battery chemistries can be conceptualized by employing anions as the primary charge carriers. F-ion conversion chemistries show promise but have limited cyclability as a result of the significant change in volume of active electrodes upon metal−metal fluoride interconversion. In contrast, the exploration of insertion chemistries has been stymied by the lack of hosts amenable to reversible F-ion insertion at room temperature. In this study, we showed reversible and homogeneous topochemical insertion/deinsertion and bulk diffusion of F ions within the one-dimensional tunnels of sub-micrometer-sized FeSb2O4 particles at room temperature. The insertion of F ions is evidenced by formal oxidation of the iron centers from Fe2+ to Fe3+ with a lattice volume contraction of
2. NSLS-II Friday Lunchtime Seminar

   "Spin-charge Higgs mode in bilayer iridates"

   Presented by Mark Dean, CMPMSD / BNL

   Friday, August 28, 2020, 12 pm
   via Zoom - contact: nsls2user@bnl.gov

   Hosted by: Ignace Jarrige

   Spontaneous symmetry breaking at phase transitions is one of the richest topics in physics describing situations as diverse as magnetism, through freezing, to how elementary particles acquire mass. Phase transitions can be classified into two categories based on whether the phase or the amplitude of the order parameter softens at the transition. In particle physics, both types of transition are well-known and termed either Nambu–Goldstone modes or Higgs Bosons for phase and amplitude modes, respectively. In insulating magnets, order is overwhelmingly conceptualized in terms of phase (i.e. Nambu–Goldstone) softening. In this talk, I will describe our resonant inelastic x-ray scattering (RIXS) experiments which reveal a Higg's amplitudon mode in bilayer magnetic Sr3Ir2O7. We attribute this mode to spin-charge coupled excitations arising from the narrow Mott-gap in this insulator. The material's proximity to a quantum critical point softens the amplitudon to excitation energies only sightly above the phase mode, allowing an active engagement of the mode in the magnetic phase transition. Our work provides a new solid-state platform for research on the dynamics of the Higgs mode and a means to understand novel magneto-transport in moderately correlated magnets.
3. NSLS-II Friday Lunchtime Seminar

   "Phyllosilicates and X-ray amorphous materials on Earth and Mars, characterization with synchrotron radiation"

   Presented by Michael T. Thorpe, NASA Johnson Space Center, Houston, TX

   Friday, August 21, 2020, 12 pm
   ZoomGov

   Hosted by: Ignace Jarrige

   Phyllosilicates and secondary X-ray amorphous materials have the unique ability to record a history of sedimentary processing and the environmental conditions during their formation. These materials are abundant in Martian sedimentary rocks, as identified from the CheMin instrument on the Curiosity rover. However, their atomic structures lack long-range order, making them difficult to characterize with CheMin and laboratory instruments. Synchrotron radiation provides a state-of-the-art technique to characterize the structure and composition of these juvenile alteration products. Using sediments from the basaltic terrains of Iceland , we seek to understand how the composition and short-range atomic order of secondary phases evolve from source to sink.
4. Summer Sundays

   "National Synchrotron Light Source II"

   Sunday, August 16, 2020, 3:30 pm
   Virtual

   Tune in to get an up-close look at the "beamlines" where scientists use ultrabright x-ray light to see the atomic structure of batteries, proteins, and more. Then, viewers will have the opportunity to pose questions to a panel of scientists.
5. NSLS-II Friday Lunchtime Seminar

   "Use of synchrotron X-ray footprinting to reveal allosteric changes in a key plant metabolic enzyme"

   Presented by Rohit Jain, Case Western Reserve University, OH

   Friday, August 7, 2020, 12 pm
   ZoomGov

   Hosted by: Ignace Jarrige

   X-ray footprinting (XFP) is a tried-and-true method for probing macromolecule structure in solution. In XFP, hydroxyl radicals produced by X-ray radiolysis covalently label protein side chains and cleave phosphodiester backbones of nucleic acids, providing insight into macromolecular structure and dynamics that complements data obtained from crystallography, cryo-EM, and small-angle X-ray scattering. XFP beamline (17-BM) at NSLS-II uniquely provides unmatched photon flux density and high level of automation to help resolve challenging biophysical questions, not obtainable by other structural probes. Recent developments in mass spectrometry have advanced the structural analysis and can provide detailed sub-peptide and residue level information for protein footprinting studies. In this talk, we will illustrate the use of synchrotron X-ray footprinting technique for studying structural changes in KIN10 enzyme, a key plant metabolic enzyme, after binding to its phosphorylated disaccharide ligand.
6. NSLS-II Friday Lunchtime Seminar

   "Quantum materials meet coherent x-rays"

   Presented by Xiaoqian Chen, NSLS-II

   Friday, July 31, 2020, 12 pm
   Zoom Invitation

   Hosted by: Ignace Jarrige

   Quantum materials are a class of materials whose properties are deeply rooted in quantum mechanical processes. A few examples include unconventional superconductors and magnets, topological insulators, and multiferroics. Phase nonuniformity and dynamics in quantum materials play a crucial role in deciding their ground states. This calls for a microscopic tool that is also sensitive to a wide range of dynamical time scales. In this talk, I will discuss why synchrotron coherent x-rays are an ideal tool. I will review recent developments in this field with an emphasis on the speckle correlation analysis performed at NSLSII, and discuss some future topics to explore.
7. NSLS-II Friday Lunchtime Seminar

   "New opportunities for IXS at the GALAXIES beamline, Synchrotron SOLEIL"

   Presented by J-P. Rueff, Synchrotron SOLEIL, France

   Friday, July 24, 2020, 12 pm
   Zoom Invitation

   Hosted by: Ignace Jarrige

   The GALAXIES undulator beamline at Synchrotron SOLEIL is dedicated to inelastic x-ray scattering (IXS) and high energy photoemission (HAXPES) spectroscopy in the tender x-ray range (2.3 – 12 keV) [1]. We will present recent scientific results illustrating the capabilities of the IXS endstation at GALAXIES with an emphasis on extreme conditions [2,3] and x-ray Raman spectroscopy [4]. Ongoing instrumental developments for improved energy resolution, faster acquisition scheme and larger collection angle will be discussed. Finally, we will explore the new possibilities offered by the future SOLEIL Upgrade program. [1] Rueff et al., J. Synchrotron Rad. 22 (2015), 175 [2] Lebert et al., PNAS 116 (2019), 20280 [3] Mazzone et al., Phys. Rev. Lett. 124 (2020), 125701 [4] Georgiou et al., Science Advances 5 (2019), eaaw5019
8. NSLS-II Friday Lunchtime Seminar

   "Characterization of Lithium & Sodium Batteries using Synchrotron X-ray Techniques at NSLS II"

   Presented by Zulipiya Shadike, BNL / Chemistry Department

   Friday, July 10, 2020, 12 pm
   via Zoom - contact: nsls2user@bnl.gov

   Hosted by: Ignace Jarrige

   The utilization of anion redox reaction is opening a new approach to increase rechargeable capacities in alkaline ion batteries recently. It is important to understand the oxidation state and electronic structure of anion in the electrodes at different state of charge. Herein, we designed and synthesized the O3-NaCr2/3Ti1/3S2 (NCTS) material, which is delivering a high capacity of 190 mAh g-1 (0.95 Na+) as a cathode for sodium battery based on the cation and anion redox processes. To study the underlying nature of anionic redox chemistry in this layered chalcogenide, we investigated the charge compensation mechanism and structure evolution of NCTS electrode using multi-model synchrotron x-ray techniques and scanning transmission electron microscopy. Our experimental results provided core evidence to reveal various charge compensation mechanisms, involving the formation of electron holes, anionic dimers, and disulfide-like species. These results provide a new insight to clarify the nature of anionic redox process of layered chalcogenides, which is important for the development of novel cathode materials with high energy density.
9. NSLS-II Seminar

   "Considerations of accelerator design for future NSLS-II upgrade"

   Presented by Timur Shaftan, NSLS-II, Accelerator Division Director

   Friday, June 19, 2020, 12 pm
   Zoom Invitation

   Hosted by: Ignace Jarrige
10. NSLS-II Friday Lunchtime Seminar

    "Structural biology in drug discovery: Development of viral protease inhibitors"

    Presented by Scott Lovell, University of Kansas, KS

    Friday, June 12, 2020, 12 pm
    via Zoom - contact: nsls2user@bnl.gov

    Hosted by: Ignace Jarrige

    X-ray crystallography is a widely utilized technique to provide essential high resolution structural information for proteins and is particularly important to determine inhibitor binding modes for drug development. Modern advances in protein crystallization automation, synchrotron X-ray beamlines and crystallographic software development have enabled the rapid determination of crystal structures which has greatly facilitated drug discovery and development projects. Diffraction data for dozens of protein-inhibitor samples can be collected in a matter of hours and immediately analyzed for inhibitor binding using automated crystallographic software pipelines. As such, information regarding the binding modes of various inhibitors can be quickly obtained which facilitates subsequent optimization. Application of these modern structural biology techniques has been critical to the advancement of ongoing collaborative projects focused on the development of covalent inhibitors that target the 3CL proteases of Norovirus, MERS-CoV, SARS-CoV and SARS-CoV-2.
11. NSLS-II Friday Lunchtime Seminar

    "Correlating microscopic materials properties with superconducting qubit performance"

    Presented by Anjali Premkumar, Department of Electrical Engineering, Princeton University

    Friday, June 5, 2020, 12 pm
    via Zoom - contact: nsls2user@bnl.gov

    Hosted by: Ignace Jarrige

    In recent years, evidence has emerged that superconducting qubit performance is limited by imperfections in constituent materials. To characterize the microscopic character of these imperfections, we performed measurements of qubit lifetimes in parallel with structural and electron microscopy of the niobium films used in qubit fabrication. Correlations were found between qubit relaxation times and several materials properties, including grain size, oxide composition on the surface and within grain boundaries, and residual resistance. These findings represent a novel approach to understanding sources of qubit decoherence, utilizing techniques such as hard x-ray photoelectron spectroscopy and transmission electron microscopy.
12. NSLS-II Friday Lunchtime Seminar

    "Understanding the improved cycling performance of sulfurized polyacrylonitrile cathode in Li-S battery"

    Presented by Seongmin Bak, Chemistry Division, Brookhaven National Laboratory

    Friday, May 29, 2020, 12 pm
    via Zoom - contact: nsls2user@bnl.gov

    Hosted by: Ignace Jarrige

    The demands on low cost and high energy density rechargeable batteries for both transportation and large-scale stationary energy storage are stimulating more research toward new battery systems such as metal, metal-sulfur, metal-air, and multivalent batteries. Since sulfur is an earth-abundant material with low cost and has a high theoretical capacity, Li-S battery chemistry has attracted significant interest during the past decade. The Li-S battery utilizes electrochemical conversion of sulfur (S8) to lithium sulfide (Li2S), going through multiple electron transfer processes associated with long- and short-chain polysulfide (Li2Sx) intermediates. It is well known that the long-chain polysulfides can be dissolved into electrolyte with aprotic organic solvents and migrated to the Li anode side. This so-called "shuttle effect" is considered as the main reason for the capacity loss and low coulombic efficiency of the Li-S system. A lot of efforts have been made on how to overcome the problem of polysulfide dissolution through new sulfur-based material and electrolyte, as well as cell engineering. Sulfurized polyacrylonitrile (SPAN) is a promising material capable of suppressing polysulfide dissolution in Li-S batteries with carbonate-based electrolytes. However, undesirable spontaneous formation of soluble polysulfides may arise in the ether-based electrolyte, and the conversion of sulfur in SPAN during the lithiation/delithiation process is yet to be understood clearly. In this talk, our recent characterization study on the SPAN cathode material in Li-S battery using spatially-resolved X-ray fluorescence (XRF) microscopy combined with X-ray absorption spectroscopy (XAS) will be present. The morphology changes and the redistribution of sulfur and polysulfide in both the SPAN cathode and lithium metal anode were monitored through the XRF images, while the chemical state changes of SPAN and sulfur-containing interfacial layer (i.
13. NSLS-II Friday Lunchtime Seminar

    "Catalysis with XAFS and XPS at the Brazilian synchrotron: examples and perspectives"

    Presented by Daniela Coelho de Oliveira, LNLS, Brazil

    Friday, March 6, 2020, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    In this talk, I will present some recent results of catalysts characterization obtained at the Brazilian synchrotron using XAS and/or XPS . I will show a brief perspective of the new capabilities that are planned to attend the catalysis community as well as other research areas.
14. NSLS-II Friday Lunchtime Seminar

    "Probing the short-range spin correlations of CuGeO3 with time-resolved RIXS"

    Presented by Thorsten Schmitt, Paul Scherrer Institut, Photon Science Division, Swiss Light Source, Switzerland

    Friday, February 28, 2020, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Resonant Inelastic X-ray Scattering (RIXS) has become a versatile tool for probing quantum materials, allowing simultaneous access to charge, lattice, spin and orbital degrees of freedom. Much of its success in recent years has been driven by huge improvements in instrumentation, and with the recent advent of X-ray free electron lasers such as the LCLS, it has become possible to translate this technique into the time-domain. Given its ability to address multiple degrees of freedom at once, time-resolved RIXS (trRIXS) therefore has huge potential for investigating materials with cooperative dynamics. Nevertheless, it remains technically very challenging to perform such experiments. We performed trRIXS at the oxygen K-edge in order to probe short-range spin correlations in CuGeO3. This quasi-1D material formed of chains of edge-sharing CuO4 plaquettes, displays pronounced anti-ferromagnetic (AFM) nearest-neighbor spin correlations and transitions into a spin-Peierls phase below 14 K, highlighting a close relation between magnetic and lattice sub-systems. As a result of these AFM correlations a Zhang-Rice singlet (ZRS) exciton can develop during the RIXS process, resulting in a distinct energy loss peak within the charge transfer gap. The amplitude of this ZRS exciton directly reflects the nearest-neighbor AFM correlations [1]. By photoexciting CuGeO3 across the charge gap (~4 eV) we induce a sudden reduction of the intensity of the ZRS exciton within 1 ps, which rapidly recovers before gradually decreasing again towards a stable value after ~10 ps. Comparison to equilibrium measurements and a thermal model reveal that the longer time scale dynamics are dominated by heating of the lattice. However, the initial drop and recovery of the ZRS at short time scales clearly imply a non-thermal behavior. In comparison, lower fluence data shows only a thermal component, suggesting a threshold effect. By comparison with model Hamiltonian calculations we reveal
15. NSLS-II Friday Lunchtime Seminar

    "Effect of Metal (Pt, Ir) Nuclearity in the Subnanometer Regime on CO Oxidation Activity"

    Presented by Ayman M. Karim, Department of Chemical Engineering, Virginia Polytechnic Institute and State University

    Friday, February 21, 2020, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Supported noble metal catalysts are extensively used in industry and their catalytic performance is strongly affected by particle size and shape. In the last decade, supported single atoms and clusters in the subnanometer size regime have attracted a lot of interest since they maximize the metal utilization and have also shown extraordinary catalytic properties for many reactions. However, to tailor the catalyst properties for specific reactions and determine possible limitations, there is a need to understand, on the atomic scale, the origin of reactivity in the subnanometer regime. In this seminar, I will present my group's efforts in understanding the role of metal nuclearity and electronic properties in catalyzing CO oxidation as a model reaction. Using a suite of advanced characterization techniques (aberration-corrected electron microscopy, microcalorimetry, in-situ and in-operando DRIFTS, XPS, EXAFS and HERFD-XANES) complemented by DFT calculations and detailed kinetics measurements, the catalyst structural and electronic properties are identified and correlated with the reaction kinetics. In the talk, CO oxidation on Ir and Pt single atoms and subnanometer clusters supported on MgAl2O4 and CeO2, respectively, will be presented. We identified the active Ir and Pt single atom complexes and show that the reaction follows a combination of Eley-Rideal and Mars-van Krevelen mechanisms. Moreover, we show that despite considered a non-reducible support, CO oxidation on MgAl2O4 supported Ir subnanometer clusters follows a similar mechanism as on a reducible oxide where O2 is activated at the metal-support interface. Finally, the role of metal-support interaction in O2 activation and effect of CO binding strength on the catalytic activity will be discussed.
16. NSLS-II Colloquium

    "Subsurface Landscapes of Oxidation and Reaction in the Critical Zone"

    Presented by Susan Brantley, Pennsylvania State University, PA

    Thursday, February 13, 2020, 4 pm
    Large Seminar Room, Bldg. 510

    Hosted by: John Hill

    The globally ubiquitous mineral pyrite oxidizes even at low oxygen concentrations. As the most common crustal sulfide, pyrite reactivity impacts sulfur, iron, oxygen, and carbon budgets globally. We discovered that pyrite oxidizes completely at tens of meters depth even in low-porosity rocks in catchments in humid climates. As erosion exposes the pyrite to near-surface conditions in low porosity rocks, pore and fracture development is the main control on the rate of oxidative weathering. Between fractures, oxygen diffusion limits the weathering and oxidation is inferred to be largely abiotic because bacteria cannot enter rock matrix pores. Oxygen concentrations and erosion rates together can explain pyrite-derived sulfate fluxes in rivers to the ocean and may account for the presence or absence of pyrite in detrital sediments over Earth history.
17. NSLS-II Friday Lunchtime Seminar

    "Tracing Processes Involving the Reactive Intermediates of To Better Understand the Role of Sulfur Cycling on the Fate of Arsenic and Iron in Sediments; Using Reactive Intermediates to Document Extensive Cryptic Sulfur Cycling Affecting Arsenic Levels"

    Presented by BENJAMIN C. BOSTICK, Columbia University, Palisades, NY

    Friday, January 31, 2020, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Arsenic (As) groundwater contamination is thought to result from the reductive dissolution of As-bearing iron oxides by microorganisms. Our understanding of the how reactions occur commonly depends on observing the consumption and production of reactants and products respectively. This approach can be insufficient in environmental systems containing complex compositions and phases that can react through multiple and distinct coupled biological and chemical processes. We suggest it is more effective to study environmental processes by considering dissolved and mineral species as reactive intermediates in geochemical cycles where their concentration is controlled by the balance between their production, consumption and transport. Here, we apply this approach to elucidate a critical role of sulfur (S) cycling in iron reduction in sediments affected by As contamination. Arsenic (As) contamination in soil and groundwater is commonly associated with iron reduction because the concentration of dissolved As and Fe(II) increase together as Fe(III) minerals convert to Fe(II) minerals. In contrast, sulfate concentrations are usually low and stable in groundwaters affected by As. This stability is often interpreted as evidence for the minimal role of S cycling in Fe reduction; however, there is mounting biochemical and mineralogical evidence that sulfate reduction is active and critical to both Fe(III) reduction and As mobilization. Sediment iron mineralogies indicate that reactive Fe(III) minerals are present in most sediments and this Fe(III) is particularly susceptible to chemical and biological reduction. These Fe minerals were transformed to Fe(II) carbonate, green rusts, and, rarely, iron sulfides as the sediments became reduced. The microorganisms identified in sediments undergoing reduction were not iron reducers, and often were autotrophs involved in S cycling. This data suggests that sulfate reduction is active, and tightly coupled to the oxidation of sulfide and elem
18. NSLS-II Friday Lunchtime Seminar

    "Real-space Local Correlated Motion in Liquids studied by using Inelastic Scattering"

    Presented by Yuya Shinohara, Oak Ridge National Laboratory

    Friday, January 17, 2020, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Liquids are critical to our daily life. A paramount example is water, which covers 70% of the Earth's surface and make up about 80% of our body. Liquids are also crucial to many current energy technologies. Despite their importance, our understanding of liquids at the atomic level is much poorer than that for crystalline solids. Particularly elusive is a detailed description of the correlated dynamics in liquids, which is the key to controlling the transport properties of liquids. Recent progress in inelastic X-ray/neutron scattering makes it possible to obtain inelastic scattering spectra over a wide energy transfer (E) and momentum transfer (Q) with a high E- and Q-resolution within a reasonable amount of time. This enables us to calculate the Van Hove correlation functions via Fourier transform. With this novel approach, we have determined spatial and temporal correlations of molecular motion of liquids. In this presentation, I will present our recent efforts in understanding the real-space local correlated motion in liquids.
19. CSI Q Seminar

    "Probing quantum entanglement at the Electron Ion Collider"

    Presented by Dmitri Kharzeev, Stony Brook University and BNL

    Wednesday, December 18, 2019, 1:30 pm
    Training Room, Bldg 725

    Hosted by: Layla Hormozi

    The structure functions measured in deep-inelastic scattering are related to the entropy of entanglement between the region probed by the virtual photon and the rest of the hadron. This opens new possibilities for experimental and theoretical studies using the Electron Ion Collider. The real-time evolution of the final state in deep-inelastic scattering can be addressed with quantum simulations using the duality between high energy QCD and the Heisenberg spin chain.
20. NSLS-II Friday Lunchtime Seminar

    "Operation at 500mA average current on the horizon"

    Presented by Alexei Blednykh, NSLS-II

    Friday, December 6, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Igna

    500mA average current achieved in NSLS-II. Limitations on the total average current will be discussed in details. Localized heating of the vacuum components was the major issue. Since the heating issues were resolved we were able to demonstrate 500mA during the beam study time. However, for the regular operation @500mA we need more power from the RF system to compensate the synchrotron radiation losses produced by the bending magnets, present and future insertion devices. To mitigate the heating issue and increase the beam stability, bunch lengthening will be beneficial for NSLS-II.
21. NSLS-II Friday Lunchtime Seminar

    "In Situ & ACERT - The LANL-BNL Cathode Collaboration"

    Presented by John Smedley, Los Alamos National Laboratory

    Friday, November 22, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    The Applied Cathode Enhancement and Robustness Technologies (ACERT) capability at LANL and the in-situ x-ray analysis growth chamber at BNL are two of the premier tools available for development of photocathode technologies. We are following a model of innovation and collaboration to move cathodes from lab to application, guided by theory, modeling, and experimental validation. This presentation will focus on two recent technology advances – cathodes with "atomic armor", single monolayers of coatings to the cathode surface and/or substrate to improve lifetime and enable operating in inferior vacuum, and highly crystalline CsTe, providing evidence that better crystallinity can improve QE while supporting an ultra-smooth surface. We hope to engender both technical discussion in these areas and open the door to future collaborations. LA-UR-19-28272
22. NSLS-II Friday Lunchtime Seminar

    "Local structures of Sn-doped BCZT lead-free ferroelectrics"

    Presented by Frederick Peter Marlton, Aarhus University, Denmark

    Friday, November 15, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige
23. NSLS-II Friday Lunchtime Seminar

    "Underpinning the nuclear fuel cycle with synchrotron and laboratory based X-ray absorption spectroscopy"

    Presented by Neil Hyatt, University of Sheffield, United Kingdom

    Friday, November 8, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Nuclear energy provides about 30% of the world's low carbon electricity supply, from more than 450 civil nuclear reactors. The supporting nuclear fuel cycle comprises a suite of industrial processes, which transform uranium ore into nuclear fuel, and support reactor operations, decommissioning, waste management, and geological disposal. This seminar will highlight three case studies in the application of X-ray absorption spectroscopy (XAS) in the nuclear fuel cycle, embracing environmental contamination, nuclear forensics, and radioactive waste management. In addition to exploitation of state of the art micro-focus multi-modal beamlines at synchrotron light sources, I will also show how we are using new developments in laboratory based XAS instrumentation, to probe element speciation in nuclear materials.
24. CSI Q Seminar

    "Many-body physics with atoms and molecules under quantum control"

    Presented by Sebastain Will, Columbia University

    Thursday, November 7, 2019, 3 pm
    Conference room 201, Bldg 734

    Hosted by: Layla Hormozi

    Over the past decade, quantum simulators based on ultracold atoms have emerged as a powerful tool to address open questions in strongly interacting systems and nonequilibrium quantum dynamics that have relevance in all areas of physics, from strongly correlated materials to cosmology. Today, quantum simulators based on ultracold dipolar molecules are within experimental reach, which exploit long-range dipole-dipole interactions and will give access to new classes of strongly correlated many-body systems. In this talk, I will present our efforts towards quantum simulation with ultracold dipolar molecules. In trailblazing experiments we have demonstrated the creation of ultracold molecules via atom-by-atom assembly, which yields complete control over the molecular degrees of freedom, including electronic, vibrational, rotational, and nuclear spin states. Exploiting this control, we have observed long nuclear spin coherence times in molecular ensembles, which makes ultracold molecules an interesting candidate for the realization of a long-lived quantum memory. In addition, the dipole-dipole interactions between molecules can be flexibly tuned via external electrostatic and microwave fields. This motivates our current work towards two-dimensional systems of strongly interacting molecules, which promises access to novel quantum phases, will enable high-speed simulation of quantum magnetism, and points towards potential quantum computing schemes based on ultracold molecules. In the end, I will briefly present our new project on enhancing quantum coherence by dissipation in programmable atomic arrays. For this effort we will develop a novel nanophotonic platform that will enable trapping of individual atoms in optical tweezer arrays with unprecedented accuracy and high-speed tunability.
25. NSLS-II Friday Lunchtime Seminar

    "Disentangling the nematode-microbiome interactions underlying long-term different crop rotation systems"

    Presented by Kaile Zhang, University of Florida

    Friday, October 25, 2019, 12:30 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Integrating two years of bahiagrass (Paspalum notatum) into conventional peanut (Arachis hypogea L.) and cotton (Gossypium hirsutum L.) cropping systems (bahiagrass-bahiagrass- peanut-cotton) improves soil quality and crop production compared with the conventional peanut-cotton-cotton rotation (CR). However, it is unclear if this system, known as a sod-based rotation (SBR), affects interactions within soil biota and if such interactions affect nutrient cycling and soil fertility. In this study, we collected soils from long-term plots under CR and SBR (located in Quincy, FL), before cotton planting. Our results showed that the metabolic activities of relative low trophic groups (i.e., bacterivores and herbivores) were positively correlated with r-strategists irrespective of cropping systems, but negatively with k-strategists only under CR. These demonstrated that microbial communities under higher rotational diversity contributed larger to C, energy, and nutrient flows in soil food webs relative to CR. Compared with SBR, one or more functional nematodes groups were entirely missing or showed few abundances, and less evenness of the microbial community was exhibited under CR in spite of no significant differences between these twoKo systems. These results imply that SBR with greater rotational diversity induced higher soil community diversity and consequently sustains the distribution of soil biological community, with positive effects on soil nutrient availability and the control of plant parasites.
26. NSLS-II Friday Lunchtime Seminar

    "Plant-fungal symbiosis and their potential impacts on terrestrial biogeochemistry"

    Presented by Ko-Hsuan (Koko) Chen, University of Florida

    Friday, October 25, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Fungi are associated with all lineages of land plants. While plant-fungal symbiosis is common, many of their interactions, ranging from mutualism, commensalism, to parasitism are yet to be determined. As plant-fungal symbiosis are tightly linked to nutrient cycling, different interaction types have substantial impacts on biogeochemistry. Here, we will use two plant-fungal symbiosis examples: 1) Pine and their ectomycorrhizal fungi, and 2) mosses and their associated fungi, to illustrate how considering plant-fungal interaction and biogeochemistry together can further our understanding toward a better understanding of plant-fungal biology.
27. NSLS-II Friday Lunchtime Seminar

    "Imaging antiferromagnetic domains using x-ray Bragg phase contrast at CSX beamline"

    Presented by Valery Kiryukhin, Rutgers University, New Jersey

    Friday, October 4, 2019, 10:30 am
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    We review our recent experiments on imaging antiphase antiferromgnetic domains at CSX-1. The technique utilizes interference effects revealing the domain boundaries. The measurements produce direct images, and are done in real time.
28. NSLS-II Friday Lunchtime Seminar

    "Crystal Engineering of Lanthanide Metal-Organic Frameworks (Ln-MOFs): A Rational pproach to Designing Materials with Targeted Applications"

    Presented by Zeyar Min, Univ of the West Indies, Mona Campus, Jamaica

    Friday, September 27, 2019, 12:30 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Metal-organic frameworks (MOFs) are hybrid organic/inorganic structures with well-defined topologies which feature metal ions or clusters bridged by rigid organic linkers and have attracted immense interest for their catalytic, sensing, magnetic and adsorption properties among others. Their high porosity (surface areas of up to 7000 m2/g) can be exploited to encapsulate a wide variety of guest molecules and numerous possibilities for tunable characteristics arise from careful manipulation of both the organic and inorganic components. One of the crystal engineering approaches of MOFs is reticular synthesis and enables rational design and assembly of novel porous materials by utilizing building blocks with varying structures and functionalities to attain certain desired physical and chemical properties. However, reticular synthesis using lanthanide metals ions as building blocks is disinclined due to their high coordination numbers and unpredictable coordination chemistry. Herein, a new approach to the crystal engineering of Ln-MOFs, their ratiometric tunable luminescence properties and ability to sense metal ions and components of nitroaromatic explosives is presented.
29. NSLS-II Friday Lunchtime Seminar

    "Quantum Computing on crystalline beams of ions: the concept and proof-of-principle experiments"

    Presented by Timur Shaftan, NSLS-II

    Friday, September 27, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    One of the promising directions in Quantum Computers (QC) is based on using ion traps. In a modern QC, several tens of ions are collected in an electromagnetic trap of a cm in size, with their motion cooled down to micro K temperature level, leading to entanglement of their quantum states, controlled by laser and RF fields. These ions = qubits then used to run quantum computations at unprecedent rate using specialized codes (check, for example, QuTip, Quantum Toolbox in Python). I will discuss a concept of a QC, which holds a promise to support 105 of qubits in contrast to the state-of-the-art devices. The idea is to use crystalline beams of ions in an accelerator as the medium for qubits. The crystalline beams were demonstrated in storage rings in 1980s when many protons, being cooled with electron beam formed a revolving ring with crystalline-like structure inside. Marrying this concept with that of the QC on a conventional ion trap, one might consider expansion of the QC to a large particle accelerator with high qubit capacity. The latter is important for expansion of QC capabilities, including the processing power and robustness against errors due to decoherence. In this presentation I will go over the concept and my analysis of a few challenges that require proof-of-principal experiments so that the some basic aspects of this interesting concept are validated.

Currently showing events from the past year. See all past events »

1. MX Macromolecular Training Workbench (2020-2)

   July 29-31, 2020
2. LiX Solution Scattering Workbench (2020-2)

   July 27-29, 2020
3. NSLS-II and CFN Users' Meeting

   May 18-20, 2020
4. LiX Solution Scattering Workbench 2020

   February 13-15, 2020
5. Short Course on X-ray Absorption Fine Structure: Theory, Data Analysis and Modeling (XAFS 2019)

   November 13-15, 2019
6. Exploring New Science Frontiers at NSLS-II

   October 21-23, 2019
7. LiX Solution Scattering Workbench (2019-3)

   September 23-25, 2019
8. Teacher Training: Exploring Proteins with a New Light

   July 1-3, 2019
9. 11th International Conference on Inelastic X-ray Scattering (IXS2019)

   June 23-28, 2019
10. 4th International Conference on Resonant Elastic X-ray Scattering (REXS 2019)

    June 17-21, 2019
11. LiX Solution Scattering Workbench

    May 29-31, 2019
12. 2019 NSLS-II & CFN Joint Users' Meeting

    May 20-22, 2019
13. In Celebration of International Women's Day 2019

    March 8, 2019
14. LiX Solution Scattering Workbench

    February 14-16, 2019
15. Short Course: Introduction to X-ray Absorption Spectroscopy

    November 6-8, 2018
16. NOBUGS 2018: New Opportunities for Better User Group Software

    October 22-26, 2018
17. NSLS-II Pair Distribution Function School 2018

    September 17-19, 2018
18. 10th International Workshop on X-ray Radiation Damage to Biological Samples

    September 13-14, 2018
19. Coherence 2018: International Workshop on Phase Retrieval and Coherent Scattering

    June 24-28, 2018
20. 2018 NSLS-II and CFN Users' Meeting

    May 21-23, 2018
21. Data Analysis and Modeling of XANES and EXAFS Spectra: Applications to Nanomaterials

    November 1-3, 2017
22. Synchrotron Environmental Science Symposium 7: Illuminating the Links Between Environmental Science and Human Health

    October 30 - November 1, 2017
23. 2017 NSLS-ll and CFN Users' Meeting

    May 15-17, 2017
24. High-Brightness Synchrotron Light Source Workshop

    April 26-27, 2017
25. X-ray Absorption Fine Structure Spectroscopy (XAFS) Short Course: Principles and Applications

    November 2-4, 2016
26. 14th International Conference on Surface X-ray and Neutron Scattering (SXNS14)

    July 10-14, 2016
27. 2016 NSLS-ll and CFN Users' Meeting

    May 23-25, 2016
28. Short Course: Advanced Topics in XAFS Data Analysis and Modeling

    November 5-7, 2015
29. 8th International Workshop on Infrared Microscopy and Spectroscopy using Accelerator Based Sources

    October 11-15, 2015
30. Collaboration Meeting on "Simulation and Modeling for SR Sources and X-Ray Optics"

    October 1-2, 2015
31. NSLS-II Strategic Planning Workshop

    September 24-25, 2015
32. 23rd International Congress on X-ray Optics and Microanalysis (ICXOM23)

    September 14-18, 2015
33. Complementary Methods in X-ray Spectroscopic, Structural, and Imaging Techniques

    July 13-14, 2015
34. 12th International Conference on Synchrotron Radiation Instrumentation (SRI 2015)

    July 6-10, 2015
35. BES Facilities Computing Working Group Meeting - May 21-22, 2015

    May 21-22, 2015
36. 2015 NSLS-II & CFN Joint Users' Meeting

    May 18-20, 2015
37. First Science at the ABBIX Beamlines

    April 21-22, 2015
38. Short Course: Methods and Applications of X-Ray Absorption Fine Structure Spectroscopy

    November 13-15, 2014
39. NSLS "Last Light"

    September 30, 2014
40. Remote Access Data Collection: Automation and Robotics at the SSRL Protein Crystallography Beam Lines

    July 17-18, 2014
41. Joint NSLS/NSLS-II & CFN Users' Meeting

    May 19-21, 2014
42. X9 SAXS Workbench

    April 24-27, 2014
43. Industrial Research at NSLS-II

    April 8-9, 2014
44. X6A Workbench: Hands-on Synchrotron Structural Biology

    February 25-28, 2014
45. X6A Workbench: Hands-on Synchrotron Structural Biology

    October 29 - November 1, 2013
46. In-situ Methods of X-ray Absorption Spectroscopy

    October 24-26, 2013
47. NSLS-II Early Experiment Workshop: IXS Focused Session

    October 1, 2013
48. NSLS-II First-Experiments Workshop

    August 12-13, 2013
49. X6A Workbench: Hands-on Synchrotron Structural Biology

    June 25-28, 2013
50. NSLS and CFN Users' Meeting

    May 20-22, 2013
51. Seventh International Workshop on Radiation Safety at Synchrotron Radiation Sources

    May 8-10, 2013
52. RapiData 2013

    April 21-26, 2013
53. X9 SAXS Workbench

    April 18-21, 2013
54. MXLS13 "New Opportunities for Magnetic Dynamics and Materials at NSLS-II and MAX-IV”

    March 24-28, 2013
55. X6A Celebrates Its 10th Anniversary!

    February 1, 2013
56. X6A Workbench: Hands-on Synchrotron Structural Biology

    January 28 - February 1, 2013
57. XANES Short Course: Theory, Analysis, Applications

    November 8-10, 2012
58. X9 SAXS Workbench

    September 20-23, 2012
59. Rock & Cell: From the Meso- to the Nanoscale with X-ray Spectromicroscopy

    September 17-18, 2012
60. X9 SAXS Workbench

    June 21-24, 2012
61. Crystallography Workbench

    June 11-13, 2012
62. Synchrotron Radiation in Art and Archaeology

    June 5-8, 2012
63. Synchrotron Radiation in Art and Archaeology (SR2A)

    June 5-8, 2012
64. 2012 NSLS/CFN Joint Users' Meeting

    May 21-23, 2012
65. Operando IV

    4th International Congress on Operando Spectroscopy

    April 29 - May 3, 2012
66. 4th International Congress on Operando Spectroscopy

    April 29 - May 3, 2012
67. Joint InSynC-INCREASE Workshop

    April 18-19, 2012
68. X6A Workbench: Hands-on Synchrotron Structural Biology

    March 27-30, 2012
69. X9 SAXS Workbench

    March 8-10, 2012
70. XAFS Short Course: Introduction to the Experiment, Data Analysis and Modeling

    November 3-5, 2011
71. X9 SAXS Workbench

    October 13-16, 2011
72. Photon Sciences Users' Executive Committee and Town Meetings

    August 12, 2011
73. Materials Diffraction Suite Workshop

    July 18-20, 2011
74. 2011 NSLS/CFN Users' Meeting

    May 23-25, 2011
75. Workshop on Supercritical Carbon Dioxide-Materials Interactions

    March 21-23, 2011
76. Advanced Topics in XAFS Data Modeling

    November 4-6, 2010
77. EPICS Collaboration Meeting - Fall 2010

    October 7-14, 2010
78. 2010 Joint NSLS and CFN Users Meeting

    May 24-26, 2010
79. In Situ and Operando XAFS Experiments and Data Analysis

    October 22-24, 2009
80. MX Frontiers at the One Micron Scale

    July 23-24, 2009
81. The Experimental Program to Stimulate Competitive Research (EPSCoR) Review 2009

    July 20-23, 2009
82. INCREASE Workshop

    Interdisciplinary Consortium for Research and Educational Access in Science and Engineering

    July 15-17, 2009
83. International Workshop for New Opportunities in Hard X-ray Photoelectron Spectroscopy: HAXPES 2009

    May 20-22, 2009
84. 2009 NSLS / CFN Users' Meeting

    May 18-20, 2009
85. Applications of Synchrotron Techniques in Glass Research

    April 6-7, 2009