Quasi-one-dimensional first- and second-order topological insulators: Bi<sub>4</sub>X<sub>4</sub> (X = Br, I)

Recently, quasi-one-dimensional materials Bi₄X₄ (X = Br, I) in both α and β crystalline phases have been proposed as a promising platform for the realization of various topological insulator (TI) phases [e.g., PRL 116, 066801 (2016)]. This list includes the strong TI, the weak TI, and the second-order TI with helical hinge states. We perform first-principles calculations and construct an effective model for Bi₄X₄. These results allow us to derive all the aforementioned TI phases and guide future experimental studies.

*This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2018R1A2B6007837), Creative-Pioneering Researchers Program through Seoul National University (C.Y and H.M), the Global Ph.D Fellowship Program through NRF of Korea funded by Korean Government under Grant No. 2016H1A2A1907780 (C.Y.), and the Army Research Office and was accomplished under Grant Number W911NF-18-1-0416. (F.Z.)

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session Y03: Transport in Topological Systems: Theory and Experiment

Abstract: Y03.00004 : Quasi-one-dimensional first- and second-order topological insulators: Bi4X4 (X = Br, I)*

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Abstract: Y03.00004 : Quasi-one-dimensional first- and second-order topological insulators: Bi₄X₄ (X = Br, I)*