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Neutral edge modes in a superconductor-topological-insulator hybrid structure in a perpendicular magnetic field

Tiwari, Rakesh P. and Zuelicke, U. and Bruder, C. and Stojanovic, Vladimir M.. (2014) Neutral edge modes in a superconductor-topological-insulator hybrid structure in a perpendicular magnetic field. Europhysics letters, Vol. 108, H. 1 , 17009.

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Official URL: http://edoc.unibas.ch/dok/A6338914

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Abstract

We study the low-energy edge states of a superconductor-3D topological-insulator hybrid structure (NS junction) in the presence of a perpendicular magnetic field. The hybridization of electron-like and hole-like Landau levels due to Andreev reflection gives rise to chiral edge states within each Landau level. We show that by changing the chemical potential of the superconductor, this junction can be placed in a regime where the sign of the effective charge of the edge state within the zeroth Landau level changes more than once resulting in neutral edge modes with a finite value of the guiding-center coordinate. The appearance of these neutral edge modes is related to the level repulsion between the zeroth and the first Landau levels in the spectra. We also find that these neutral edge modes come in pairs, one in the zeroth Landau level and its corresponding pair in the first. Unlike ordinary neutral bogolon excitations in superconductors, the neutral modes found by us have a finite speed and, thus, the potential to carry a heat current. Copyright (C) EPLA, 2014
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bruder, Christoph and Tiwari, Rakesh
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Les ├ęditions de physique
ISSN:0302-072X
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Mar 2015 07:44
Deposited On:06 Mar 2015 07:44

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