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Majorana bound states in topological insulators with hidden Dirac points

Schulz, Ferdinand and Plekhanov, Kirill and Loss, Daniel and Klinovaja, Jelena. (2020) Majorana bound states in topological insulators with hidden Dirac points. Physical Review Research, 2 (3). 033215.

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Official URL: https://edoc.unibas.ch/80703/

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Abstract

We address the issue of whether it is possible to generate Majorana bound states at the magnetic-superconducting interface in two-dimensional topological insulators with hidden Dirac points in the spectrum. In this case, the Dirac point of edge states is located at the energies of the bulk states such that two types of states are strongly hybridized. Here, we show that well-defined Majorana bound states can be obtained even in materials with a hidden Dirac point provided that the width of the magnetic strip is chosen to be comparable with the localization length of the edge states. The obtained topological phase diagram allows one to extract precisely the position of the Dirac point in the spectrum. In addition to standard zero-bias peak features caused by Majorana bound states in transport experiments, we propose to supplement future experiments with measurements of charge and spin polarization. In particular, we demonstrate that both observables flip their signs at the topological phase transition, thus providing an independent signature of the presence of topological superconductivity. All features remain stable against substantially strong disorder.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
e-ISSN:2643-1564
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Apr 2021 15:11
Deposited On:29 Apr 2021 15:08

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