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Condensed Matter > Superconductivity
Title: Higher-order topological superconductivity in a topological metal 1T$^\prime$-MoTe$_2$
(Submitted on 12 Dec 2022 (v1), last revised 1 Sep 2023 (this version, v3))
Abstract: One key challenge in the field of topological superconductivity (Tsc) has been the rareness of material realization. This is true not only for the first-order Tsc featuring Majorana surface modes, but also for the higher-order Tsc, which host Majorana hinge and corner modes. Here, we propose a four-step strategy that mathematically derives comprehensive guiding principles for the search and design for materials of general higher-order Tsc phases. Specifically, such recipes consist of conditions on the normal state and pairing symmetry that can lead to a given higher-order Tsc state. We demonstrate this strategy by obtaining recipes for achieving three-dimensional higher-order Tsc phases protected by the inversion symmetry. Following our recipe, we predict that the observed superconductivity in centrosymmetric MoTe$_2$ is a candidate for higher-order Tsc with corner modes. Our proposed strategy enables systematic materials search and design for higher-order Tsc, which can mobilize the experimental efforts and accelerate the material discovery for higher-order Tsc phases.
Submission history
From: Yi-Ting Hsu [view email][v1] Mon, 12 Dec 2022 19:15:37 GMT (3860kb,D)
[v2] Wed, 14 Dec 2022 18:19:40 GMT (3860kb,D)
[v3] Fri, 1 Sep 2023 18:29:08 GMT (3954kb,D)
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