Topological phases in Bi/Sb planar and buckled honeycomb monolayers

We investigate topological phases in two-dimensional Bi/Sb honeycomb crystals considering planar, buckled, freestanding and deposited on a substrate structures. We use the multi-orbital tight-binding model and compare results with density functional theory methods. We distinguish topological phases...

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Bibliographic Details
Published in:arXiv.org 2018-02
Main Authors: Nouri, N, Bieniek, M, Brzezinska, M, Modarresi, M, S Zia Borujeni, Rashedi, Gh, Wojs, A, Potasz, P
Format: Article
Language:English
Subjects:
Antimony
Bismuth
Crystal structure
Density functional theory
Entanglement
Honeycomb construction
Phases
Resistance
Substrates
Topological insulators
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Summary:We investigate topological phases in two-dimensional Bi/Sb honeycomb crystals considering planar, buckled, freestanding and deposited on a substrate structures. We use the multi-orbital tight-binding model and compare results with density functional theory methods. We distinguish topological phases by calculating topological invariants, analyze edge states of systems in a ribbon geometry and by looking at their entanglement spectra. We show that weak coupling to the substrate of buckled and planar crystals is sufficient to lead to a transition to the \(Z_2\) topological insulator phase. Topological crystalline insulator (TCI) phase exhibits a pair of edge states in the semi-infinite geometry and in the entanglement spectrum. Transport calculations for TCI phases show robust quantized conductance even in a presence of symmetry-breaking disorder.
ISSN:2331-8422
DOI:10.48550/arxiv.1711.01055