Flow-enhanced pairing and other unusual effects in Fermi gases in synthetic gauge fields

Shenoy, Vijay B (2013) Flow-enhanced pairing and other unusual effects in Fermi gases in synthetic gauge fields. In: PHYSICAL REVIEW A, 88 (3).

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Abstract

Recent experiments on fermions in synthetic gauge fields result in systems with a spin-orbit coupling along one spatial axis, a detuning field, and a Zeeman field. We show theoretically that the presence of all three results in interesting and unusual phenomena in a system of interacting fermions (interactions described by a scattering length). For two fermions, bound states appear only over a certain range of the center-of-mass momenta. The deepest bound state appears at a nonzero center-of-mass momentum. For center-of-mass momenta without a bound state, the gauge field induces a resonance-like feature in the scattering continuum resulting in a large scattering phase shift. In the case of many particles, we demonstrate that the system, in a parameter range, shows flow-enhanced pairing, i.e., a Fulde-Farrell-Larkin-Ovchnnikov superfluid state made of robust pairs with a finite center-of-mass momentum. Yet another regime of parameters offers the opportunity to study strongly interacting normal states of spin-orbit-coupled fermionic systems utilizing the resonance-like feature induced by the synthetic gauge field.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW A
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copyright for this article belongs to APS
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Oct 2013 11:37
Last Modified:	17 Oct 2013 11:37
URI:	http://eprints.iisc.ac.in/id/eprint/47516

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