| Issue |
EPL
Volume 109, Number 1, January 2015
|
|
|---|---|---|
| Article Number | 16003 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/109/16003 | |
| Published online | 23 January 2015 | |
The third virial coefficient of a two-component unitary Fermi gas across an Efimov-effect threshold
1 Institute for Advanced Study, Tsinghua University - Beijing, 100084, China
2 Laboratoire Kastler Brossel, ENS- PSL, CNRS, UPMC-Sorbonne Universités, Collège de France - Paris, France
Received: 30 October 2014
Accepted: 19 December 2014
We consider a mixture of two single-spin-state fermions with an interaction of negligible range and infinite s-wave scattering length. By varying the mass ratio α across $\alpha_c\simeq 13.6069$ one can switch on and off the Efimov effect. We determine analytically the third cluster coefficient of the gas. We show that it is a smooth function of α across $\alpha_c$ since, unexpectedly, the three-body parameter characterizing the interaction is relevant even on the non-Efimovian side $\alpha<\alpha_c$ .
PACS: 67.85.-d – Ultracold gases, trapped gases
© EPLA, 2015
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