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Condensed Matter > Strongly Correlated Electrons
Title: Superconducting instabilities in a spinful Sachdev-Ye-Kitaev model
(Submitted on 23 Dec 2020 (v1), last revised 23 Jul 2021 (this version, v3))
Abstract: We introduce a spinful variant of the Sachdev-Ye-Kitaev model with an effective time reversal symmetry, which can be solved exactly in the limit of a large number $N$ of degrees of freedom. At low temperature, its phase diagram includes a compressible non-Fermi liquid and a strongly-correlated spin singlet superconductor that shows a tunable enhancement of the gap ratio predicted by BCS theory. These two phases are separated by a first-order transition, in the vicinity of which a gapless superconducting phase, characterized by a non-zero magnetization, is stabilized upon applying a Zeeman field. We study equilibrium transport properties of such superconductors using a lattice construction, and propose a physical platform based on topological insulator flakes where they may arise from repulsive electronic interactions.
Submission history
From: Étienne Lantagne-Hurtubise [view email][v1] Wed, 23 Dec 2020 05:17:55 GMT (1230kb,D)
[v2] Fri, 4 Jun 2021 16:40:53 GMT (968kb,D)
[v3] Fri, 23 Jul 2021 17:25:59 GMT (968kb,D)
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