Majorana bound states in topological insulators with hidden Dirac points
arXiv:2004.10623 · doi:10.1103/PhysRevResearch.2.033215
Abstract
We address the issue 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 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.
arXiv comment11 pages, 11 figures
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- Anomalous flux periodicity in proximitised quantum spin Hall constrictions
- Buried Dirac points in quantum spin Hall insulators: Implications for Majorana Kramers pair-based quantum computing
- Distinguishing Majorana bound states from accidental zero-energy modes with a microwave cavity