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Motion of a Solitonic Vortex in the BEC-BCS Crossover

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arxiv 1402.7052 v1 pith:UJPV2OAI submitted 2014-02-27 cond-mat.quant-gas cond-mat.str-elcond-mat.supr-con

classification cond-mat.quant-gascond-mat.str-elcond-mat.supr-con
keywords vortexbec-bcscrossoverlongmotionperiodsolitonicsuperfluid
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abstract

We observe a long-lived solitary wave in a superfluid Fermi gas of $^6$Li atoms after phase-imprinting. Tomographic imaging reveals the excitation to be a solitonic vortex, oriented transverse to the long axis of the cigar-shaped atom cloud. The precessional motion of the vortex is directly observed, and its period is measured as a function of the chemical potential in the BEC-BCS crossover. The long period and the correspondingly large ratio of the inertial to the bare mass of the vortex are in good agreement with estimates based on superfluid hydrodynamics that we derive here using the known equation of state in the BEC-BCS crossover.

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