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arXiv · 1708.08894

Entanglement and exotic superfluidity in spin-imbalanced lattices

Vivian V. França
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Abstract

We investigate the properties of entanglement in one-dimensional fermionic lattices at the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid regime. By analyzing occupation probabilities, which are concepts closely related to FFLO and entanglement, we obtain approximate analytical expressions for the spin-flip processes at the FFLO regime. We also apply density matrix renormalization group calculations to obtain the exact ground-state entanglement of the system in superfluid and non-superfluid regimes. Our results reveal a breaking pairs avalanche appearing precisely at the FFLO-normal phase transition. We find that entanglement is non-monotonic in superfluid regimes, feature that could be used as a signature of exotic superfluidity.

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Vivian V. França. 2017-08-29. Entanglement and exotic superfluidity in spin-imbalanced lattices. https://doi.org/10.1016/j.physa.2017.02.013

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