Tunable hybridization of Majorana bound states at the quantum spin Hall edge

Felix Keidel, Pablo Burset, Björn Trauzettel

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)
209 Downloads (Pure)

Abstract

Confinement at the helical edge of a topological insulator is possible in the presence of proximity-induced magnetic (F) or superconducting (S) order. The interplay of both phenomena leads to the formation of localized Majorana bound states (MBS) or likewise (under certain resonance conditions) the formation of ordinary Andreev bound states (ABS). We investigate the properties of bound states in junctions composed of alternating regions of F or S barriers. Interestingly, the direction of magnetization in F regions and the relative superconducting phase between S regions can be exploited to hybridize MBS or ABS at will. We show that the local properties of MBS translate into a particular nonlocal superconducting pairing amplitude. Remarkably, the symmetry of the pairing amplitude contains information about the nature of the bound state that it stems from. Hence this symmetry can in principle be used to distinguish MBS from ABS, owing to the strong connection between local density of states and nonlocal pairing in our setup.

Original languageEnglish
Article number075408
Pages (from-to)1-10
JournalPhysical Review B
Volume97
Issue number7
DOIs
Publication statusPublished - 7 Feb 2018
MoE publication typeA1 Journal article-refereed

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