Universal contact and collective excitations of a strongly interacting Fermi gas
Abstract
We study the relationship between Tan's contact parameter and the macroscopic dynamic properties of an ultracold trapped gas, such as the frequencies of the collective oscillations and the propagation of sound in one-dimensional (1D) configurations. We find that the value of the contact, extracted from the most recent low-temperature measurements of the equation of state near unitarity, reproduces with accuracy the experimental values of the collective frequencies of the radial breathing mode at the lowest temperatures. The available experiment results for the 1D sound velocities near unitarity are also investigated.
- Publication:
-
Physical Review A
- Pub Date:
- August 2011
- DOI:
- 10.1103/PhysRevA.84.023628
- arXiv:
- arXiv:1105.6238
- Bibcode:
- 2011PhRvA..84b3628L
- Keywords:
-
- 03.75.Kk;
- 03.75.Ss;
- 05.30.Fk;
- 67.85.-d;
- Dynamic properties of condensates;
- collective and hydrodynamic excitations superfluid flow;
- Degenerate Fermi gases;
- Fermion systems and electron gas;
- Ultracold gases trapped gases;
- Condensed Matter - Quantum Gases
- E-Print:
- 5 pages, 3 figures