Diffusion Monte Carlo study of strongly interacting two-dimensional Fermi gases

Galea, Alexander; Dawkins, Hillary; Gandolfi, Stefano; Gezerlis, Alexandros

doi:10.1103/PhysRevA.93.023602

Title: Diffusion Monte Carlo study of strongly interacting two-dimensional Fermi gases

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.93.023602· OSTI ID:1335626

Galea, Alexander ^[1]; Dawkins, Hillary ^[2]; Gandolfi, Stefano ^[3]; Gezerlis, Alexandros ^[1]

Univ. of Guelph, Guelph, ON (Canada)
Univ. of Guelph, Guelph, ON (Canada); Univ. of Waterloo, Waterloo, ON (Canada)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Ultracold atomic Fermi gases have been a popular topic of research, with attention being paid recently to two-dimensional (2D) gases. In this work, we perform T=0 ab initio diffusion Monte Carlo calculations for a strongly interacting two-component Fermi gas confined to two dimensions. We first go over finite-size systems and the connection to the thermodynamic limit. After that, we illustrate pertinent 2D scattering physics and properties of the wave function. We then show energy results for the strong-coupling crossover, in between the Bose-Einstein condensation (BEC) and Bardeen-Cooper-Schrieffer (BCS) regimes. Our energy results for the BEC-BCS crossover are parametrized to produce an equation of state, which is used to determine Tan's contact. We carry out a detailed comparison with other microscopic results. Lastly, we calculate the pairing gap for a range of interaction strengths in the strong coupling regime, following from variationally optimized many-body wave functions.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1335626

Alternate ID(s):: OSTI ID: 1236542

Report Number(s):: LA-UR-15-28921; PLRAAN

Journal Information:: Physical Review A, Vol. 93, Issue 2; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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