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 Physical Review A: Atomic, Molecular, and Optical Physics and Quantum Information, 88 (3). Article ID 033609. ISSN 1050-2947

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Official URL: https://journals.aps.org/pra/abstract/10.1103/Phys...

Related URL: http://dx.doi.org/10.1103/PhysRevA.88.033609

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:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:106122
Deposited On:01 Feb 2018 09:53
Last Modified:01 Feb 2018 09:53

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