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Three-dimensional superconductors with hybrid higher-order topology

Author(s): Bultinck, Nick; Bernevig, Bogdan A.; Zaletel, Michael P.

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Abstract: We consider three-dimensional superconductors in class DIII with a fourfold rotation axis and inversion symmetry. It is shown that such systems can exhibit higher-order topology with helical Majorana hinge modes. In the case of even-parity superconductors, we show that higher-order topological superconductors can be obtained by adding a small pairing with the appropriate C-4 symmetry implementation to a topological insulator. We also show that a hybrid case is possible, where Majorana surface cones resulting from nontrivial strong topology coexist with helical hinge modes. We propose a bulk invariant detecting this hybrid scenario, and numerically analyze a tight binding model exhibiting both Majorana cones and hinge modes.
Publication Date: 15-Mar-2019
Electronic Publication Date: 26-Mar-2019
Citation: Bultinck, Nick, Bernevig, B Andrei, Zaletel, Michael P. (2019). Three-dimensional superconductors with hybrid higher-order topology. PHYSICAL REVIEW B, 99, doi:10.1103/PhysRevB.99.125149
DOI: doi:10.1103/PhysRevB.99.125149
ISSN: 2469-9950
EISSN: 2469-9969
Pages: 125149-1 - 125149-13
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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