Buckled honeycomb antimony: Higher order topological insulator and its relation to the Kekulé lattice

Higher order topological tnsulators are d-spatial dimensional systems featuring topologically protected gapless states at their (d − n) -dimensional boundaries. With the help of ab initio calculations and tight-binding models along with symmetry considerations, we show that monolayer buckled honeyco...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2020-09, Vol.102 (11), p.1, Article 115104
Main Authors: Radha, Santosh Kumar, Lambrecht, Walter R. L.
Format: Article
Language:English
Subjects:
antimonene
Antimony
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Honeycomb structures
MATERIALS SCIENCE
Quadrupoles
Symmetry
topological band structure
Topological insulators
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Higher order topological tnsulators are d-spatial dimensional systems featuring topologically protected gapless states at their (d − n) -dimensional boundaries. With the help of ab initio calculations and tight-binding models along with symmetry considerations, we show that monolayer buckled honeycomb structures of group-V elements (Sb, As), which have already been synthesized, belong in this category and have a spinless charge fractionalization of e/2 at the corner states as well as weak topological edge states, protected by the S6 symmetry operation, which classify this system as a quadrupole topological insulator. The robustness of these edge and corner states to perturbations is explicitly demonstrated.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.115104