Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S55: Electronic Properties of Twisted Transition Metal Dichalcogenides
8:00 AM–10:48 AM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Adler
Sponsoring
Unit:
DCMP
Chair: Ryan Muzzio
Abstract: S55.00011 : Theoretical study of twisted bilayer Bi2(Te,Se)3
10:00 AM–10:12 AM
Presenter:
Ikuma Tateishi
(RIKEN)
Authors:
Ikuma Tateishi
(RIKEN)
Motoaki Hirayama
(RIKEN)
Here, we propose twisted bilayer Bi2(Te,Se)3 as a new Moiré superlattice system and show a result of our theoretical study on its novel topological properties. Untwisted Bi2(Te,Se)3 is one of the well-known topological insulators, and it is reported that the topological invariant of a thin film Bi2(Te,Se)3 strongly depends on the number of stacked layers. By driving the stacking-dependent phase transition with Moiré superlattice structure, we show a twisted bilayer Bi2(Te,Se)3 has topological insulator domains and normal insulator domains in the Moiré unit cell. We also show there are corresponding edge states at the domain boundaries, and they are quantized by a finite size effect of the boundaries and result in Moiré flat bands. Moreover, in the Moiré band structure, we have obtained topological insulator phases with Moiré scale edge states that emerge from the domain-boundary edge states.
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