Seidl, Michael and Bhaduri, Rajat K. (2007) Fermionic density functional at a Feshbach resonance. PHYSICAL REVIEW A, 75 (5): 052509. ISSN 1050-2947,
Full text not available from this repository.Abstract
We consider a dilute gas of neutral unpolarized fermionic atoms at zero temperature. The atoms interact via a short-range (tunable) attractive interaction. We demonstrate analytically a curious property of the gas at unitarity. Namely, the correlation energy of the gas, evaluated by second-order perturbation theory, has the same density dependence as the first-order exchange energy, and the two almost exactly cancel each other at a Feshbach resonance irrespective of the shape of the potential, provided (mu rs) >> 1. Here (mu)(-1) is the range of the two-body potential, and rs is defined through the number density, n=3/ (4 pi r(s)(3)). The implications of this result for universality are discussed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GAS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2020 09:39 |
| Last Modified: | 14 Dec 2020 09:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32856 |
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