Ideal weak topological insulator and protected helical saddle points

被引：1

作者：

Oh, Ji Seop ^{[1
,2
]}

Xu, Tianyi ^{[3
]}

Dhale, Nikhil ^{[3
]}

Li, Sheng ^{[3
]}

Lei, Chao ^{[4
]}

Yoon, Chiho ^{[3
]}

Liu, Wenhao ^{[3
]}

Huang, Jianwei ^{[2
]}

Wu, Hanlin ^{[3
]}

Hashimoto, Makoto ^{[5
]}

Lu, Donghui ^{[5
]}

Jozwiak, Chris ^{[6
]}

Bostwick, Aaron ^{[6
]}

Rotenberg, Eli ^{[6
]}

Lau, Chun Ning ^{[7
]}

Lv, Bing ^{[3
]}

Zhang, Fan ^{[3
]}

Birgeneau, Robert J. ^{[1
,8
]}

Yi, Ming ^{[2
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Rice Univ, Dept Phys & Astron, Houston, TX 77024 USA

[3] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA

[4] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[5] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[7] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[8] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2023年 / 108卷 / 20期

基金：

美国国家科学基金会;

关键词：

Compendex;

D O I：

10.1103/PhysRevB.108.L201104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the design and observation of an ideal weak topological insulator in a quasi-one-dimensional bismuth halide, Bi4I1.2Br2.8. Via angle-resolved photoemission spectroscopy, we identify that Bi4I1.2Br2.8 hosts topological surface states on the (100)' side surface in the form of two anisotropic pi-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.

引用

页数：6

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