Topological phases in Bi/Sb planar and buckled honeycomb monolayersShow others and affiliations
2018 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 382, no 40, p. 2952-2958Article in journal (Refereed) Published
Abstract [en]
We investigate topological phases in two-dimensional Bi/Sb honeycomb crystals considering planar and buckled structures, both freestanding and deposited on a substrate. We use the multi-orbital tight-binding model and compare results with density functional theory calculations. We distinguish topological phases by calculating topological invariants, analyzing edge states properties of systems in a ribbon geometry and studying their entanglement spectra. We show that coupling to the substrate induces transition to the Z(2) topological insulator phase. It is observed that topological crystalline insulator (TCI) phase, found in planar crystals, exhibits an additional pair of edge states in both energy spectrum and entanglement spectrum. Transport calculations for TCI phase suggest robust quantized conductance even in the presence of crystal symmetry-breaking disorder. (C) 2018 Elsevier B.V. All rights reserved.
Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 382, no 40, p. 2952-2958
Keywords [en]
Topological insulators; Bismuth; Antimony
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-151630DOI: 10.1016/j.physleta.2018.06.037ISI: 000444663200008OAI: oai:DiVA.org:liu-151630DiVA, id: diva2:1251756
Note
Funding Agencies|National Science Center (NCN), Poland [2014/14/A/ST3/00654]
2018-09-272018-09-272018-09-27