Critical velocity, vortex shedding and drag in a unitary Fermi superfluid
arXiv:1301.5133 · doi:10.1103/PhysRevA.87.013637
Abstract
We study the real-time motion of a microscopic object in a cold Fermi gas at unitary conditions by using an extended Thomas-Fermi density functional approach. We find that spontaneous creation of singly quantized vortex-antivortex pairs occurs as a critical velocity is exceeded, which leads to a drag between the moving object and the Fermi gas. The resulting force is linear in the velocity for subsonic motion and becomes quadratic for supersonic motion.
7 pages, 7 figures (accepted for publication in Phys. Rev. A)
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