Ideal weak topological insulator and protected helical saddle points

Oh, Ji Seop; Xu, Tianyi; Dhale, Nikhil; Li, Sheng; Lei, Chao; Yoon, Chiho; Liu, Wenhao; Huang, Jianwei; Wu, Hanlin; Hashimoto, Makoto; Lu, Donghui; Jozwiak, Chris; Bostwick, Aaron; Rotenberg, Eli; Lau, Chun Ning; Lv, Bing; Zhang, Fan; Birgeneau, Robert J.; Yi, Ming

doi:10.1103/physrevb.108.l201104

Title: Ideal weak topological insulator and protected helical saddle points

Journal Article · 07 November 2023 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.108.l201104 · OSTI ID:2328189

^[1]; Xu, Tianyi ^[2]; Dhale, Nikhil ^[2]; Li, Sheng ^[2]; Lei, Chao ^[3]; Yoon, Chiho ^[2]; Liu, Wenhao ^[2];

^[4]; Wu, Hanlin ^[2]; Hashimoto, Makoto ^[5]; Lu, Donghui ^[5];

^[6]; Bostwick, Aaron ^[6]; Rotenberg, Eli ^[6]; Lau, Chun Ning ^[7]; Lv, Bing ^[2];

^[2];

^[8];

^[4]

University of California, Berkeley, CA (United States); Rice University, Houston, TX (United States)
University of Texas at Dallas, Richardson, TX (United States)
University of Texas, Austin, TX (United States)
Rice University, Houston, TX (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
The Ohio State University, Columbus, OH (United States)
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Materials Sciences Division

Here we report the design and observation of an ideal weak topological insulator in a quasi-one-dimensional bismuth halide, Bi₄I_1.2Br_2.8. Via angle-resolved photoemission spectroscopy, we identify that Bi₄I_1.2Br_2.8 hosts topological surface states on the (100)′ side surface in the form of two anisotropic π-offset Dirac cones while topologically dark on the (001) top surface. The results fully determine a unique side-surface Hamiltonian and thereby identify two pairs of nondegenerate helical saddle points. The fact that both the surface Dirac and helical saddle points are in the global bulk band gap of 195 meV suggests the potential of this system to be a fertile ground for topological many-body physics.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); Army Research Office (ARO); National science Foundation (NSF); Robert A. Welch Foundation; Gordon and Betty Moore Foundation

Grant/Contract Number:: AC02-76SF00515; AC02- 05CH11231; DMR-1921798; DMR-1921847; C-2024; GBMF9470; DMR-1921581; DMR-1945351; FA9550-19-1-0037; W911NF-18-1-0416

OSTI ID:: 2328189

Journal Information:: Physical Review. B, Vol. 108, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
electronic structure
surface states
topological insulators
topological materials
angle-resolved photoemission spectroscopy

Title: Ideal weak topological insulator and protected helical saddle points

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