Critical velocity, vortex shedding and drag in a unitary Fermi superfluid

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.

arXiv comment7 pages, 7 figures (accepted for publication in Phys. Rev. A)

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Cited by in corpus (4)

• Quantized Superfluid Vortex Rings in the Unitary Fermi Gas
• Critical Vortex Shedding in a Strongly Interacting Fermionic Superfluid
• Validating Simple Dynamical Simulations of the Unitary Fermi Gas
• Vortex shedding patterns in holographic superfluids at finite temperature