We present a recipe for an electronic two-dimensional (2D) higher order topological insulator (HOTI) on a 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 Z2 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.

Recipe for higher order topology on the triangular lattice / Eck, Philipp; Fang, Yuan; Di Sante, Domenico; Sangiovanni, Giorgio; Cano, Jennifer. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - ELETTRONICO. - 107:11(2023), pp. 115130.1-115130.10. [10.1103/physrevb.107.115130]

Recipe for higher order topology on the triangular lattice

Di Sante, Domenico;
2023

Abstract

We present a recipe for an electronic two-dimensional (2D) higher order topological insulator (HOTI) on a 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 Z2 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.
2023
Recipe for higher order topology on the triangular lattice / Eck, Philipp; Fang, Yuan; Di Sante, Domenico; Sangiovanni, Giorgio; Cano, Jennifer. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - ELETTRONICO. - 107:11(2023), pp. 115130.1-115130.10. [10.1103/physrevb.107.115130]
Eck, Philipp; Fang, Yuan; Di Sante, Domenico; Sangiovanni, Giorgio; Cano, Jennifer
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/962420
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