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Substrate effect on edge states of a quantum spin Hall insulator in Kane–Mele model

Title
Substrate effect on edge states of a quantum spin Hall insulator in Kane–Mele model
Authors
Shin J.Jeon G.S.
Ewha Authors
전건상
SCOPUS Author ID
전건상scopus
Issue Date
2019
Journal Title
European Physical Journal B
ISSN
1434-6028JCR Link
Citation
European Physical Journal B vol. 92, no. 4
Keywords
Solid State and Materials
Publisher
Springer Heidelberg
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Abstract: We investigate the topological phases and the edge states of a quantum spin Hall insulator of the Kane–Mele model placed on top of a two-dimensional normal insulator caused by the staggered lattice potential. We show that, in the parameter space of interlayer hopping and the staggered lattice potential, there occurs a topological phase transition between the two phases, topological and normal insulating phases. Effective Hamiltonian for the edge states is constructed and it is verified that it reproduces well the edge-state energy dispersion in the presence of small interlayer hopping. Finally, we estimate the edge-state width by fitting the probability densities numerically and discuss how the edge-state width changes near the phase boundary and in an asymptotic region. Graphical abstract: [Figure not available: see fulltext.]. © 2019, EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature.
DOI
10.1140/epjb/e2019-90683-y
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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