Quantized Superfluid Vortex Rings in the Unitary Fermi Gas
arXiv:1306.4266 · doi:10.1103/PhysRevLett.112.025301
Abstract
In a recent article, Yefsah et al. [Nature 499, 426 (2013)] report the observation of an unusual excitation in an elongated harmonically trapped unitary Fermi gas. After phase imprinting a domain wall, they observe oscillations almost an order of magnitude slower than predicted by any theory of domain walls which they interpret as a "heavy soliton" of inertial mass some 200 times larger than the free fermion mass or 50 times larger than expected for a domain wall. We present compelling evidence that this "soliton" is instead a quantized vortex ring by showing that the main aspects of the experiment can be naturally explained within the framework of time-dependent superfluid DFT.
Minor changes to match published version, one new figure. Hi resolution figures and movies available at http://www.phys.washington.edu/~bulgac/media_files/VR
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