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- W3186935292 abstract "The two-dimensional spin-imbalanced Fermi gas subject to $s$-wave pairing and spin-orbit coupling is considered a promising platform for realizing a topological chiral-$p$-wave superfluid. In the BCS limit of $s$-wave pairing, i.e., when Cooper pairs are only weakly bound, the system enters the topological phase via a second-order transition driven by increasing the Zeeman spin-splitting energy. Stronger attractive two-particle interactions cause the system to undergo the BCS-BEC crossover, in the course of which the topological transition becomes first order. As a result, topological and nontopological superfluids coexist in spatially separated domains in an extended region of phase space spanned by the strength of $s$-wave interactions and the Zeeman energy. Here we investigate this phase-coexistence region theoretically using a zero-temperature mean-field approach. Exact numerical results are presented to illustrate basic physical characteristics of the coexisting phases and to validate an approximate analytical description derived for weak spin-orbit coupling. Besides extending our current understanding of spin-imbalanced superfluid Fermi systems, the present approach also provides a platform for future studies of unconventional Majorana excitations that, according to topology, should be present at the internal interface between coexisting topological and nontopological superfluid parts of the system." @default.
- W3186935292 created "2021-08-02" @default.
- W3186935292 creator A5009562687 @default.
- W3186935292 creator A5014742963 @default.
- W3186935292 creator A5055625695 @default.
- W3186935292 date "2021-12-21" @default.
- W3186935292 modified "2023-09-23" @default.
- W3186935292 title "Coexistence of topological and nontopological Fermi-superfluid phases" @default.
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- W3186935292 doi "https://doi.org/10.1103/physrevresearch.3.043201" @default.
- W3186935292 hasPublicationYear "2021" @default.
- W3186935292 type Work @default.