2015/04/30 by Hao Shi, Simone Chiesa, Shiwei Zhang · 4 citations
Physics and Astronomy · #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Ground state #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #State (computer science) #Statistical physics #cond-mat.quant-gas #cond-mat.str-el
paper · pdf · doi:10.1103/physreva.92.033603
published as Phys. Rev. A 92, 033603 (2015) · 8 pages, 5 figures
openalex publication_date 2015/09/08 · arxiv created 2016/03/19 · arxiv updated 2016/03/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Exact calculations are performed on the two-dimensional strongly interacting unpolarized uniform Fermi gas with a zero-range attractive interaction. Two auxiliary-field approaches are employed which accelerate the sampling of imaginary-time paths using BCS trial wave functions and a force bias technique. Their combination enables calculations on large enough lattices to reliably compute ground-state properties in the thermodynamic limit. An equation of state is obtained with a parametrization provided, which can serve as a benchmark and allow accurate comparisons with experiments. The pressure, contact parameter, and condensate fraction are determined systematically vs kFa. The momentum distribution, pairing correlation, and the structure of the pair wave function are computed. The use of force bias to accelerate the Metropolis sampling of auxiliary fields in determinantal approaches is discussed.