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Thin films of a three-dimensional topological insulator in a strong magnetic field: a microscopic study
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. (Condensed Matter Physics Group)ORCID iD: 0000-0002-7831-7214
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. (Condensed Matter Physics Group)ORCID iD: 0000-0003-4489-7561
University of Texas at Austin.
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, 075430Article in journal (Refereed) Published
Abstract [en]

The response of thin films of Bi$_2$Se$_3$ to a strong perpendicular magnetic field is investigated  by performing magnetic bandstructure calculations for a realistic multi-band tight-binding model.   Several crucial features of Landau quantization in a realistic three-dimensional topological insulator are revealed.  The $n=0$ Landau level is absent in ultra-thin  films, in agreement with experiment.  In films with a crossover thickness of five quintuple layers, there is     a signature of the $n=0$ level, whose overall trend as a function of magnetic field matches the established  low-energy effective-model result.  Importantly, we find a field-dependent splitting and a strong spin-polarization of the $n=0$ level which can be measured experimentally at reasonable field strengths. Our calculations      show  mixing between the surface and bulk Landau levels      which causes the character of levels to evolve with magnetic field.

Place, publisher, year, edition, pages
2015. Vol. 91, 075430
Keyword [en]
topological insulator thin films, Landau levels
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-38038DOI: 10.1103/PhysRevB.91.075430ISI: 000350207800010Scopus ID: 2-s2.0-84924028254OAI: oai:DiVA.org:lnu-38038DiVA: diva2:761358
Funder
Swedish Research Council, 621-2010-3761
Available from: 2014-11-06 Created: 2014-11-06 Last updated: 2017-12-05Bibliographically approved

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