Friday, May 15, 2020, 11:00 am — Webcast
Motivated by the fermion bag approach—a quantum Monte Carlo approach that takes advantage of grouped local degrees of freedom—we consider a new class of Hamiltonian lattice field theories that can help us study fermionic quantum critical points. We construct the partition function of a lattice Hamiltonian in 2+1 dimensions in discrete time, with a temporal lattice spacing \varepsilon. When \varepsilon \rightarrow 0, we obtain the partition function of the original lattice Hamiltonian. But when \varepsilon = 1, we obtain a new type of space-time lattice field theory which treats space and time differently, but still lacks fermion doubling in the time dimension, in contrast to Lagrangian lattice field theories. Here we show that both continuous-time and discrete-time lattice field theories derived from the t-V model have a fermionic quantum critical point with critical exponents that match within errors. The fermion bag algorithms run relatively faster on the discrete-time model and allow us to compute quantities even on 100^3 lattices near the quantum critical point. Bluejeans link: https://bnl.bluejeans.com/726276981
Hosted by: Nikhil Karthik
15747 | INT/EXT | Events Calendar
Not all computers/devices will add this event to your calendar automatically.
A calendar event file named "calendar.ics" will be placed in your downloads location. Depending on how your device/computer is configured, you may have to locate this file and double click on it to add the event to your calendar.
Event dates, times, and locations are subject to change. Event details will not be updated automatically once you add this event to your own calendar. Check the Lab's Events Calendar to ensure that you have the latest event information.