Condensation energy of a spin-1/2 strongly interacting Fermi gas
Abstract
We report a measurement of the condensation energy of a two-component Fermi gas with tunable interactions. From the equation of state of the gas, we infer the properties of the normal phase in the zero-temperature limit. By comparing the pressure of the normal phase at T=0 to that of the low-temperature superfluid phase, we deduce the condensation energy, i.e., the energy gain of the system upon being in the superfluid rather than the normal state. We compare our measurements to a ladder approximation description of the normal phase and to a fixed-node Monte Carlo approach, finding excellent agreement. We discuss the relationship between condensation energy and pairing gap in the BEC-BCS crossover.
- Publication:
-
Physical Review A
- Pub Date:
- December 2013
- DOI:
- 10.1103/PhysRevA.88.063614
- arXiv:
- arXiv:1304.1661
- Bibcode:
- 2013PhRvA..88f3614N
- Keywords:
-
- 03.75.Ss;
- 05.30.Fk;
- 34.50.-s;
- Degenerate Fermi gases;
- Fermion systems and electron gas;
- Scattering of atoms and molecules;
- Condensed Matter - Quantum Gases
- E-Print:
- 4 figures