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

Koichiro Yaji; Yuya Hattori; Shunsuke Yoshizawa; Shunsuke Tsuda; Fumio Komori; Youhei Yamaji; Yuto Fukushima; Kaishu Kawaguchi; Takeshi Kondo; Yuki Tokumoto; Keiichi Edagawa; Taichi Terashima

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

Koichiro Yaji (Center for Basic Research on Materials/Advanced Materials Characterization Field/Photoemission Spectroscopy Group, National Institute for Materials Science) ; Yuya Hattori (Center for Basic Research on Materials/Advanced Materials Characterization Field/Nanoprobe Group, National Institute for Materials Science) ; Shunsuke Yoshizawa (Center for Basic Research on Materials/Advanced Materials Characterization Field/Nanoprobe Group, National Institute for Materials Science) ; Shunsuke Tsuda (Center for Basic Research on Materials/Advanced Materials Characterization Field/Photoemission Spectroscopy Group, National Institute for Materials Science) ; Fumio Komori (Center for Basic Research on Materials/Advanced Materials Characterization Field/Photoemission Spectroscopy Group, National Institute for Materials Science) ; Youhei Yamaji (Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials Field/Quantum Materials Modeling Group, National Institute for Materials Science) ; 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 (Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials Field/Quantum Material Properties Group, National Institute for Materials Science)

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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.

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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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