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Title: Path-integral Monte Carlo study of particles obeying quantum mechanics and classical statistics

Journal Article · · Physical Review A
 [1];  [1]
  1. Univ. of Guelph, ON (Canada). Dept. of Physics

Ultracold atomic systems have been of great research interest in the past, with more recent attention being paid to systems of mixed species. In this work, we carry out nonperturbative path-integral Monte Carlo (PIMC) simulations of $$N$$ distinguishable particles at finite temperature, which can be thought of as an ultracold atomic system containing $$N$$ distinct species. We use the PIMC approach to calculate thermodynamic properties of particles interacting via hard-sphere and hard-cavity potentials. The first problem we study is a two-particle system interacting via a hard-sphere and hard-cavity interaction in order to test the effectiveness of two approximations for the thermal density matrix corresponding to these potentials. We then apply the PIMC method to a system of many hard-sphere particles under periodic boundary conditions at varying temperature in order to calculate the energy per particle, pressure, and specific heat of the system. We examine how finite-size effects impact the results of PIMC simulations of hard-sphere particles and when the thermodynamic limit has been reached. Finally, our results provide microscopic benchmarks for a system containing distinguishable particles, which can be thought of as a limiting case for ultracold atomic systems of mixed species.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE
OSTI ID:
1523837
Journal Information:
Physical Review A, Vol. 96, Issue 4; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

References (62)

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Pressure, Compressibility, and Contact of the Two-Dimensional Attractive Fermi Gas text January 2015
Many-Body Physics with Ultracold Gases text January 2007
Strongly paired fermions: Cold atoms and neutron matter text January 2007
Energetics and Structural Properties of Trapped Two-Component Fermi Gases text January 2008
Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature text January 2008
Viscosity and scale invariance in the unitary Fermi gas text January 2010
Detection and manipulation of nuclear spin states in fermionic strontium text January 2011
Feynman diagrams versus Fermi-gas Feynman emulator text January 2011
Ultracold Fermi Gases with Emergent SU(N) Symmetry text January 2014
Spectroscopic observation of SU(N)-symmetric interactions in Sr orbital magnetism text January 2014
Zero-temperature equation of state of mass-imbalanced resonant Fermi gases text January 2014
A one-dimensional liquid of fermions with tunable spin text January 2014
Neutron Matter from Low to High Density text January 2015
Diffusion Monte Carlo study of strongly interacting two-dimensional Fermi gases text January 2015
Path integral Monte Carlo determination of the fourth-order virial coefficient for unitary two-component Fermi gas with zero-range interactions text January 2016
Rashba spin-orbit coupling, strong interactions, and the BCS-BEC crossover in the ground state of the two-dimensional Fermi Gas text January 2016
Efimov Physics: a review text January 2016
SU(N) Fermi liquid at finite temperature text January 2016
Degenerate Fermi Gases of Ytterbium text January 2006
Theory of Bose-Einstein condensation in trapped gases text January 1998

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