Feshbach resonance in a synthetic non-Abelian gauge field

Shenoy, Vijay B (2014) Feshbach resonance in a synthetic non-Abelian gauge field. In: PHYSICAL REVIEW A, 89 (4).

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Abstract

We study the Feshbach resonance of spin-1/2 particles in a uniform synthetic non-Abelian gauge field that produces spin-orbit coupling and constant spin potentials. We develop a renormalizable quantum field theory including the closed-channel boson which engenders the resonance. We show that the gauge field shifts the Feshbach field where the low-energy scattering length diverges. In addition the Feshbach field is shown to depend on the center-of-mass momentum of the particles. For high-symmetry gauge fields which produce a Rashba spin coupling, we show that the system supports two bound states over a regime of magnetic fields when the background scattering length is negative and the resonance width is comparable to the energy scale of the spin-orbit coupling. We discuss interesting consequences useful for future theoretical and experimental studies, even while our predictions are in agreement with recent experiments.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW A
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copyright for this article belongs to the AMER PHYSICAL SOC, USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	12 Jun 2014 09:52
Last Modified:	12 Jun 2014 09:52
URI:	http://eprints.iisc.ac.in/id/eprint/49175

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