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A topological flux trap: Majorana bound states at screw dislocations

Rex, Stefan 1; Willa, Roland 2
1 Institut für QuantenMaterialien und Technologien (IQMT), Karlsruher Institut für Technologie (KIT)
2 Institut für Theorie der Kondensierten Materie (TKM), Karlsruher Institut für Technologie (KIT)

Abstract:

The engineering of non-trivial topology in superconducting heterostructures is a very challenging task. Reducing the number of components in the system would facilitate the creation of the long-sought Majorana bound states. Here, we explore a route toward emergent topology in a trivial superconductor without a need for other proximitized materials. Specifically, we show that a vortex hosting an even number of flux quanta is capable of forming a quasi-one-dimensional topological sub-system that can be mapped to the Kitaev wire, if the vortex is trapped at a screw dislocation. This crystallographic defect breaks inversion symmetry and thereby threads a local spin-orbit coupling through the superconductor. The vortex-dislocation pair in the otherwise trivial bulk can harbor a pair of Majorana bound states located at the two surface terminations. We explain the topological transition in terms of a band inversion in the Caroli-de Gennes-Matricon vortex bound states and discuss favorable material parameters.


Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Forschungsbericht/Preprint
Publikationsdatum 16.06.2022
Sprache Englisch
Identifikator KITopen-ID: 1000148187
HGF-Programm 47.12.01 (POF IV, LK 01) Advanced Solid-State Qubits and Qubit Systems
Umfang 8 S.
Nachgewiesen in Dimensions
arXiv
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