Papers › Buckled honeycomb group-V--S₆ symmetric (d-2) higher order topological insulators
Buckled honeycomb group-V--S₆ symmetric (d-2) higher order topological insulators
Santosh Kumar Radha, Walter R. L. Lambrecht
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Higher Order Topological Insulators (HOTI) are d-spatial dimensional systems featuring topologically protected gap-less states at their (d-n)-dimensional boundaries. With the help of \textit{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 charge fractionalization of e/2 at the corner states as well as weak topological edge states, all protected by their properties under the inversion operation which classify this system as a quadrupole topological insulator.
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