Observation and control of the weak topological insulator state in ZrTe5

Zhang, Peng; Noguchi, Ryo; Kuroda, Kenta; Lin, Chun; Kawaguchi, Kaishu; Yaji, Koichiro; Harasawa, Ayumi; Lippmaa, Mikk; Nie, Simin; Weng, Hongming; Kandyba, V.; Giampietri, A.; Barinov, A.; Li, Qiang; Gu, G. D.; Shin, Shik; Kondo, Takeshi

doi:10.1038/s41467-020-20564-8

Observation and control of the weak topological insulator state in ZrTe5

Journal Article · Mon Jan 18 00:00:00 EST 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-20564-8· OSTI ID:1778522

; ; ; ; Kawaguchi, Kaishu; Yaji, Koichiro; Harasawa, Ayumi; Lippmaa, Mikk; Nie, Simin; ; Kandyba, V.; Giampietri, A.; ; Li, Qiang; Gu, G. D.; ;

Abstract

A quantum spin Hall (QSH) insulator hosts topological states at the one-dimensional (1D) edge, along which backscattering by nonmagnetic impurities is strictly prohibited. Its 3D analogue, a weak topological insulator (WTI), possesses similar quasi-1D topological states confined at side surfaces. The enhanced confinement could provide a route for dissipationless current and better advantages for applications relative to strong topological insulators (STIs). However, the topological side surface is usually not cleavable and is thus hard to observe. Here, we visualize the topological states of the WTI candidate ZrTe ₅ by spin and angle-resolved photoemission spectroscopy (ARPES): a quasi-1D band with spin-momentum locking was revealed on the side surface. We further demonstrate that the bulk band gap is controlled by external strain, realizing a more stable WTI state or an ideal Dirac semimetal (DS) state. The highly directional spin-current and the tunable band gap in ZrTe ₅ will provide an excellent platform for applications.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: JSPS KAKENHI; MEXT; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1778522

Alternate ID(s):: OSTI ID: 1767412

Report Number(s):: BNL--221073-2021-JAAM; 406; PII: 20564

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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