Recipe for higher order topology on the triangular lattice
| Autor: | Philipp Eck, Yuan Fang, Domenico Di Sante, Giorgio Sangiovanni, Jennifer Cano |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | arXiv |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.107.115130 |
| Popis: | We present a recipe for an electronic 2D higher order topological insulator (HOTI) on the triangular lattice that can be realized in a large family of materials. The essential ingredient is mirror symmetry breaking, which allows for a finite quadrupole moment and trivial $\mathbb{Z}_2$ index. The competition between spin-orbit coupling and the symmetry breaking terms gives rise to four topologically distinct phases; the HOTI phase appears when symmetry breaking dominates, including in the absence of spin-orbit coupling. We identify triangular monolayer adsorbate systems on the (111) surface of zincblende/diamond type substrates as ideal material platforms and predict the HOTI phase for $X=$(Al,B,Ga) on SiC. 5 pages, 4 figures and 1 table. Supplementary material: 5 pages, 3 figures and 10 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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