Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-04-09
Science 328, 5979 (2010) 729
Physics
Condensed Matter
Quantum Gases
28 pages, 7 figures
Scientific paper
10.1126/science.1187582
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.
Chevy Frédéric
Nascimbène Sylvain
Navon Nir
Salomon Christophe
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