Critical velocity, vortex shedding and drag in a unitary Fermi superfluid
Quantum Gases
2013-02-12 v1
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.
Keywords
Cite
@article{arxiv.1301.5133,
title = {Critical velocity, vortex shedding and drag in a unitary Fermi superfluid},
author = {F. Ancilotto and L. Salasnich and F. Toigo},
journal= {arXiv preprint arXiv:1301.5133},
year = {2013}
}
Comments
7 pages, 7 figures (accepted for publication in Phys. Rev. A)