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Title: Equation of state and contact of a strongly interacting Bose gas in the normal state

Journal Article · · Physical Review A - Atomic, Molecular, and Optical Physics
 [1];  [1];  [2];  [1]
  1. Swinburne Univ. of Technology, Melbourne (Australia)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, we theoretically investigate the equation of state and Tan's contact of a nondegenerate three-dimensional Bose gas near a broad Feshbach resonance, within the framework of large-N expansion. Our results agree with the path-integral Monte Carlo simulations in the weak-coupling limit and recover the second-order virial expansion predictions at strong interactions and high temperatures. At resonance, we find that the chemical potential and energy are significantly enhanced by the strong repulsion, while the entropy does not change significantly. With increasing temperature, the two-body contact initially increases and then decreases like T–1 at large temperature, and therefore exhibits a peak structure at about 4Tc0, where Tc0 is the Bose-Einstein condensation temperature of an ideal, noninteracting Bose gas. These results may be experimentally examined with a nondegenerate unitary Bose gas, where the three-body recombination rate is substantially reduced. In particular, the nonmonotonic temperature dependence of the two-body contact could be inferred from the momentum distribution measurement.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FT140100003; DP140100637; FT130100815; DP140103231; AC02-05CH11231; AC52-06NA25396; DOE-AC02-05CH11231
OSTI ID:
1247143
Alternate ID(s):
OSTI ID: 1178780
Report Number(s):
LA-UR-15-20742; PLRAAN
Journal Information:
Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, Issue 4; ISSN 1050-2947
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (2)

Large- N properties of a non-ideal Bose gas journal December 2018
Large-$N$ properties of a non-ideal Bose gas text January 2018

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