Gaussian quantum Monte Carlo methods for fermions and bosons.
We introduce a new class of quantum Monte Carlo methods, based on a Gaussian quantum operator representation of fermionic states. The methods enable first-principles dynamical or equilibrium calculations in many-body Fermi systems, and, combined with the existing Gaussian representation for bosons, provide a unified method of simulating Bose-Fermi systems. As an application relevant to the Fermi sign problem, we calculate finite-temperature properties of the two dimensional Hubbard model and the dynamics in a simple model of coherent molecular dissociation.
Corney
J F
JF
ARC Centre of Excellence for Quantum-Atom Optics, University of Queensland, Brisbane 4072, Queensland, Australia.
Drummond
P D
PD