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

Koichiro Yaji SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Photoemission Spectroscopy Group, National Institute for Materials ScienceROR) ; Yuya Hattori SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Nanoprobe Group, National Institute for Materials ScienceROR) ; Shunsuke Yoshizawa SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Nanoprobe Group, National Institute for Materials ScienceROR) ; Shunsuke Tsuda SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Photoemission Spectroscopy Group, National Institute for Materials ScienceROR) ; Fumio Komori (Center for Basic Research on Materials/Advanced Materials Characterization Field/Photoemission Spectroscopy Group, National Institute for Materials ScienceROR) ; Youhei Yamaji SAMURAI ORCID (Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials Field/Quantum Materials Modeling Group, National Institute for Materials ScienceROR) ; Yuto Fukushima (ISSP, Univ. of Tokyo) ; Kaishu Kawaguchi (ISSP, Univ. of Tokyo) ; Takeshi Kondo (ISSP, Univ. of Tokyo) ; Yuki Tokumoto (Univ. Tokyo, Institute for Industrial Science) ; Keiichi Edagawa (Univ. Tokyo, Institute for Industrial Science) ; Taichi Terashima SAMURAI ORCID (Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials Field/Quantum Material Properties Group, National Institute for Materials ScienceROR)

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Citation
Koichiro Yaji, Yuya Hattori, Shunsuke Yoshizawa, Shunsuke Tsuda, Fumio Komori, Youhei Yamaji, Yuto Fukushima, Kaishu Kawaguchi, Takeshi Kondo, Yuki Tokumoto, Keiichi Edagawa, Taichi Terashima. Visualization of spin-polarized surface resonances in Pb-based ternary topological insulators. Scientific Reports. 2024, 14 (), 25868.
SAMURAI

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(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(Bi1-xSbx)2Te4 (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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Keyword: Topological insulator, Surface resonance, Spin-resolved photoemission spectroscopy

Date published: 2024-10-28

Publisher: Springer Nature

Journal:

  • Scientific Reports (ISSN: 20452322) vol. 14 25868

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41598-024-76493-9

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Updated at: 2024-10-29 16:30:43 +0900

Published on MDR: 2024-10-29 16:30:43 +0900

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