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

作者：Galea Alexander^*; Dawkins Hillary; Gandolfi Stefano; Gezerlis Alexandros

来源：Physical Review A, 2016, 93(2): 023602.

DOI：10.1103/PhysRevA.93.023602

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. Finally, we calculate the pairing gap for a range of interaction strengths in the strong coupling regime, following from variationally optimized many-body wave functions.

• 出版日期2016-2-1
• 单位Los Alamos