Quantum Hall edge states in topological insulator nanoribbons
2016 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 12, 121409Article in journal (Refereed) Published
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
IdentifiersURN: urn:nbn:se:kth:diva-194267DOI: 10.1103/PhysRevB.94.121409ISI: 000384070000003ScopusID: 2-s2.0-84990882880OAI: oai:DiVA.org:kth-194267DiVA: diva2:1039923
QC 201610252016-10-252016-10-212016-10-25Bibliographically approved