Vortex-Antivortex Lattice in Ultra-Cold Fermi Gases
S. S. Botelho, C. A. R. Sa de Melo
TL;DR
This paper explores the phase diagram of ultra-cold 2D Fermi gases, revealing the emergence of vortex-antivortex pairs below a critical temperature and the formation of a lattice structure as interactions strengthen.
Contribution
It provides a detailed analysis of vortex-antivortex phenomena and lattice formation in ultra-cold Fermi gases across different coupling regimes.
Findings
Vortex-antivortex pairs appear below T_c for all couplings.
The system transitions smoothly from weak to strong coupling.
A square vortex-antivortex lattice forms below T_M.
Abstract
We discuss ultra-cold Fermi gases in two dimensions, which could be realized in a strongly confining one-dimensional optical lattice. We obtain the temperature versus effective interaction phase diagram for an s-wave superfluid and show that, below a certain critical temperature T_c, spontaneous vortex-antivortex pairs appear for all coupling strengths. In addition, we show that the evolution from weak to strong coupling is smooth, and that the system forms a square vortex-antivortex lattice at a lower critical temperature T_M.
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