Robust Weak Topological Insulator in the Bismuth Halide Bi_{4}Br_{2}I_{2}.
Phys Rev Lett
; 133(8): 086602, 2024 Aug 23.
Article
em En
| MEDLINE
| ID: mdl-39241706
ABSTRACT
We apply a topological material design concept for selecting a bulk topology of 3D crystals by different van der Waals stackings of 2D topological insulator layers, and find a bismuth halide Bi_{4}Br_{2}I_{2} to be an ideal weak topological insulator (WTI) with the largest band gap (â¼300 meV) among all the WTI candidates, by means of angle-resolved photoemission spectroscopy (ARPES), density functional theory (DFT) calculations, and resistivity measurements. Furthermore, we reveal that the topological surface state of a WTI is not "weak" but rather robust against external perturbations against the initial theoretical prediction by performing potassium deposition experiments. Our results vastly expand future opportunities for fundamental research and device applications with a robust WTI.
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MEDLINE
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En
Ano de publicação:
2024
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Article