Visualization of spin-polarized surface resonances in Pb-based ternary topological insulators

The formation of the topological surface state originates from bulk band inversion at the top of the valence band and the bottom of the conduction band. The transition between normal and topological insulators is known as a topological phase transition. Here we show spin-polarized electronic states of Pb-based ternary topological insulators Pb(Bi<sub>1-x</sub>Sb<sub>x</sub>)<sub>2</sub>Te<sub>4</sub> (x = 0.55, 0.70, 0.79) investigated by spin- and angle-resolved photoemission spectroscopy and first-principles calculations. We visualize a pair of spin-polarized surface resonances dispersing along the upper edge of projected bulk bands in occupied states. Interestingly, a branch of the spin-polarized surface resonances continuously connects to the topological surface state. The coexistence of the topological surface state and the spin-polarized surface resonances can be explained by considering the topological phase transition.

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Publication Details

Journal
Scientific Reports
Published
2024-10-28
DOI
https://doi.org/10.1038/s41598-024-76493-9
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
0.00

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article

Visualization of spin-polarized surface resonances in Pb-based ternary topological insulators

Youhei Yamaji, Kaishu Kawaguchi, Fumio Komori, Yuto Fukushima et al.
Scientific Reports
Topological Materials and Phenomena
article

Visualization of spin-polarized surface resonances in Pb-based ternary topological insulators

Youhei Yamaji, Kaishu Kawaguchi, Fumio Komori, Yuto Fukushima, Koichiro Yaji, Shunsuke Yoshizawa, Yuya Hattori, Takeshi Kondo, Yuki Tokumoto, S. Tsuda, Taichi Terashima, Keiichi Edagawa
article en

Abstract

The formation of the topological surface state originates from bulk band inversion at the top of the valence band and the bottom of the conduction band. The transition between normal and topological insulators is known as a topological phase transition. Here we show spin-polarized electronic states of Pb-based ternary topological insulators Pb(Bi<sub>1-x</sub>Sb<sub>x</sub>)<sub>2</sub>Te<sub>4</sub> (x = 0.55, 0.70, 0.79) investigated by spin- and angle-resolved photoemission spectroscopy and first-principles calculations. We visualize a pair of spin-polarized surface resonances dispersing along the upper edge of projected bulk bands in occupied states. Interestingly, a branch of the spin-polarized surface resonances continuously connects to the topological surface state. The coexistence of the topological surface state and the spin-polarized surface resonances can be explained by considering the topological phase transition.

Scientific ReportsVol. 14(1)
Tohoku University (JP), National Institute for Materials Science (JP), The University of Tokyo (JP)
Ministry of Education, Culture, Sports, Science and Technology, Japan Society for the Promotion of Science, National Institute for Materials Science
Openalex Percentile: Top 83%
Topological Materials and Phenomena
DOIOpen Access PDFOpenAlex
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