The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
Abstract
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.
- Publication:
-
Science
- Pub Date:
- April 2010
- DOI:
- arXiv:
- arXiv:1004.1465
- Bibcode:
- 2010Sci...328..729N
- Keywords:
-
- Condensed Matter - Quantum Gases
- E-Print:
- 28 pages, 7 figures