Journal
SCIENCE
Volume 328, Issue 5979, Pages 729-732Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1187582
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Funding
- European Research Council
- European Science Foundation (Euroquam)
- SCALA (Scalable Quantum Computing with Light and Atoms)
- Agence Nationale de la Recherche FABIOLA (Fermions and Bosons in Optical Lattices)
- Region Ile de France Institut Francilien de Recherche sur les Atomes Froids
- Institut Universitaire de France
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Interacting fermions are ubiquitous in nature, and understanding their thermodynamics is an important problem. We measured 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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