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arXiv · 1110.1927

Spin-Depairing Transition of Attractive Fermi Gases on a Ring Driven by Synthetic Gauge Fields

Shun Uchino·Norio Kawakami
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Abstract

Motivated by the recent experimental realization of synthetic gauge fields in ultracold atoms, we investigate one-dimensional attractive Fermi gases with a time-dependent gauge flux on the spin sector. By combining the methods of the Bethe ansatz with complex twists and Landau-Dykhne, it is shown that a spin-depairing transition occurs, which may represent a nonequilibrium transition from fermionic superfluids to normal states with spin currents caused by a many-body quantum tunneling. For the case of the Hubbard ring at half filling, our finding forms a dual concept with the dielectric breakdown of the Mott insulator discussed in Phys. Rev. B 81, 033103 (2010). We analyze cases of arbitrary filling and continuum model, and show how the filling affects the transition probability.

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Shun Uchino, Norio Kawakami. 2012-01-07. Spin-Depairing Transition of Attractive Fermi Gases on a Ring Driven by Synthetic Gauge Fields. https://doi.org/10.1103/physreva.85.013610

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