Fermionic Entanglement Entropy from Nonequilibrium Work (Jonathan D’Emidio/ LPT / Seminar). – 10/05/2022, 14H

Jonathan D’Emidio (DIPC, Saint-Sébastien)

Abstract : Computing entanglement entropies in strongly interacting many-body systems in two or more dimensions is a notoriously difficult task. Recently, however, a Monte Carlo method based on Jarzynski’s nonequilibrium work equality has enabled highly efficient calculations in quantum spin systems [1]. I will show how this concept can be extended to determinental quantum Monte Carlo (DQMC) simulations of fermions, based on the decomposition introduced by T. Grover [2]. Here the nonequilibrium method entirely avoids the severe limitations faced by existing DQMC techniques, which manifest themselves quite differently from the spin case. As a benchmark study I will provide data from T=0 projector simulations of the honeycomb Hubbard model.