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


Autoria(s): Shenoy, Vijay B
Data(s)

2013

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/47516/1/Phy_Rev_A_88-3_Shenoy.pdf

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

Publicador

AMER PHYSICAL SOC

Relação

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

http://eprints.iisc.ernet.in/47516/

Palavras-Chave #Physics
Tipo

Journal Article

PeerReviewed