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Title

Comparison between theory and experiment for universal thermodynamics of a homogeneous, strongly correlated Fermi gas

Author(s)

Hu, Hui;  Liu, Xia-Ji;  Drummond, Peter D.

Abstract

We compare the theoretical predictions for universal thermodynamics of a homogeneous, strongly correlated Fermi gas with the latest experimental measurements reported by the ENS group [S. Nascimbène et al., Nature (London) 463, 1057 (2010)] and the Tokyo group [M. Horikoshi et al., Science 327, 442 (2010)]. The theoretical results are obtained using two diagrammatic theories, together with a virial expansion theory combined with a Páde approximation. We find good agreement between theory and experiment. In particular, the virial expansion, using a Páde approximation up to third order, describes the experimental results extremely well down to the superfluid transition temperature, Tc~0.16TF, where TF is the Fermi temperature. The comparison in this work complements our previous comparative study on the universal thermodynamics of a strongly correlated but trapped Fermi gas. The comparison also raises interesting issues about the unitary entropy and the applicability of the Páde approximation.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy

Source

Physical Review A, Vol. 83, no. 6 (Jun 2011), paper no. 063610

Publication year

2011

FOR Code(s)

0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics;  0204 Condensed Matter Physics;  0205 Optical Physics

Keyword(s)

Fermi gases;  Temperature;  Thermodynamics

Publisher

American Physical Society

ISSN

1050-2947

Publisher URL

http://dx.doi.org/10.1103/PhysRevA.83.063610

Copyright

Copyright © 2011 American Physical Society. Published version of the paper reproduced here with the kind permission of the publisher.

Research Projects

Ultracold atomic Fermi gases in the strongly interacting regime: a new frontier of quantum many-body physics, Australian Research Council grant number DP0984522
Imbalanced superfluidity: the quantum mystery that defies solution, Australian Research Project grant number DP0984637

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