Surface transport anomalies of quasi-one-dimensional weak topological insulators
ORAL
Abstract
Prototypical weak topological insulators (WTI) have been theoretically predicted to be realized in quasi-one-dimensional materials Bi4X4 (X = Br, I) [PRL 116, 066801 (2016)] and then experimentally confirmed via ARPES [PRX 11, 031042 (2021) & Nature 566, 518 (2019)]. The unique surface states of such a WTI have two entangled Dirac cones with strong anisotropy. We study theoretically the integer quantum Hall effect of such WTI surface states and show the important roles played by the special geometry, symmetry, topology, and their interplay in Bi4X4. We also predict prominent signatures in transport experiments.
*We acknowledge the Texas Advanced Computing Center (TACC) for providing resources that have contributed to the research results reported in this work. We acknowledge support by the Army Research Office under grant number W911NF-18-1-0416 and by the National Science Foundation under grant numbers DMR-1945351 through the CAREER program, DMR-1921581 through the DMREF program, and DMR-2105139 through the CMP program.
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Presenters
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Tianyi Xu
- University of Texas at Dallas