Stabilization of Majorana modes in magnetic vortices in the superconducting phase of topological insulators using topologically trivial bands

Ching Kai Chiu, Pouyan Ghaemi, Taylor L. Hughes

Research output: Contribution to journalArticlepeer-review

Abstract

It has been shown that doped topological insulators, up to a certain level of doping, still preserve some topological signatures of the insulating phase such as axionic electromagnetic response and the presence of a Majorana mode in the vortices of a superconducting phase. Multiple topological insulators such as HgTe, ScPtBi, and other ternary Heusler compounds have been identified and generically feature the presence of a topologically trivial band between the two topological bands. In this Letter we show that the presence of such a trivial band can stabilize the topological signature over a much wider range of doping. Specifically, we calculate the structure of vortex modes in the superconducting phase of doped topological insulators, a model that captures the features of HgTe and the ternary Heusler compounds. We show that, due to the hybridization with the trivial band, Majorana modes are preserved over a large, extended doping range for p doping. In addition to presenting a viable system where much less fine-tuning is required to observe the Majorana modes, our analysis opens a route to study other topological features of doped compounds that cannot be modeled using the simple Bi2Se3 Dirac model.

Original languageEnglish (US)
Article number237009
JournalPhysical review letters
Volume109
Issue number23
DOIs
StatePublished - Dec 5 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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