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Quantum Hall edge states in topological insulator nanoribbons
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Linnæus University, Sweden.
2016 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 12, 121409Article in journal (Refereed) Published
Abstract [en]

We present a microscopic theory of the chiral one-dimensional electron gas system localized on the sidewalls of magnetically doped Bi2Se3-family topological insulator nanoribbons in the quantum anomalous Hall effect (QAHE) regime. Our theory is based on a simple continuum model of sidewall states whose parameters are extracted from detailed ribbon and film geometry tight-binding model calculations. In contrast to the familiar case of the quantum Hall effect in semiconductor quantum wells, the number of microscopic chiral channels depends simply and systematically on the ribbon thickness and on the position of the Fermi level within the surface state gap. We use our theory to interpret recent transport experiments that exhibit nonzero longitudinal resistance in samples with accurately quantized Hall conductances.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 94, no 12, 121409
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-194267DOI: 10.1103/PhysRevB.94.121409ISI: 000384070000003ScopusID: 2-s2.0-84990882880OAI: oai:DiVA.org:kth-194267DiVA: diva2:1039923
Note

QC 20161025

Available from: 2016-10-25 Created: 2016-10-21 Last updated: 2016-10-25Bibliographically approved

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