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Article Dans Une Revue Science Année : 2010

The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions

Nir Navon
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Sylvain Nascimbène
Frédéric Chevy
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Christophe Salomon
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Résumé

Interacting fermions are ubiquitous in nature and understanding their thermodynamics is an important problem. We measure the equation of state of a two-component ultracold Fermi gas for a wide range of interaction strengths at low temperature. A detailed comparison with theories including Monte-Carlo calculations and the Lee-Huang-Yang corrections for low-density bosonic and fermionic superfluids is presented. The low-temperature phase diagram of the spin imbalanced gas reveals Fermi liquid behavior of the partially polarized normal phase for all but the weakest interactions. Our results provide a benchmark for many-body theories and are relevant to other fermionic systems such as the crust of neutron stars.
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Dates et versions

hal-00470161 , version 1 (04-04-2010)

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Nir Navon, Sylvain Nascimbène, Frédéric Chevy, Christophe Salomon. The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions. Science, 2010, 328 (5979), pp.729. ⟨10.1126/science.1187582⟩. ⟨hal-00470161⟩
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