Kuang Zhang, Gang Chen, Suotang Jia
In this paper we investigate the spin-orbit-driven BCS-BEC crossover physics in a narrow Feshbash resonance, and mainly focus on the bound state and the striking molecular signature based on a generalized two-channel model. For a weak spin-orbit coupling, only one bound state occurs. More importantly, we find two and more bound states in the case of the strong spin-orbit coupling. This bound-state number depends strongly on the strength, and especially, the type of spin-orbit coupling. The existence of the multi-bound states is a new phenomenon induced by spin-orbit coupling. In addition, we find that the molecular number does not vanish (but approaches zero) for a fixed positive detuning in the presence of spin-orbit coupling. When varying the strength of spin-orbit coupling in the positive detuning, an unconventional molecular signature that the molecular number increases and then decreases is revealed. We believe that in experiments our predicted molecular behavior is a good signature to detect the spin-orbit-induced superfluid physics.
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http://arxiv.org/abs/1301.4718
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