Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES

Yuto Fukushima; Kaishu Kawaguchi; Kenta Kuroda; Masayuki Ochi; Hiroaki Tanaka; Ayumi Harasawa; Takushi Iimori; Zhigang Zhao; Shuntaro Tani; Koichiro Yaji; Shik Shin; Fumio Komori; Yohei Kobayashi; Takeshi Kondo

Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES

Materials Science 2023-04-03 v1

Authors: Yuto Fukushima , Kaishu Kawaguchi , Kenta Kuroda , Masayuki Ochi , Hiroaki Tanaka , Ayumi Harasawa , Takushi Iimori , Zhigang Zhao , Shuntaro Tani , Koichiro Yaji , Shik Shin , Fumio Komori , Yohei Kobayashi , Takeshi Kondo

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Abstract

We use a pump-probe, spin-, and angle-resolved photoemission spectroscopy (ARPES) with a 10.7 eV laser accessible up to the Brillouin zone edge, and reveal for the first time the entire band structure, including the unoccupied side, for the elemental bismuth (Bi) with the spin-polarized surface states. Our data identify Bi as in a strong topological insulator phase ( $Z_2$ =1) against the prediction of most band calculations. We unveil that the unoccupied topological surface states possess spin-polarized saddle points yielding the van Hove singularity, providing an excellent platform for the future development of opto-spintronics.

Keywords

bismuth topological surface states spin-polarized saddle points pump-probe arpes strong topological insulator van hove singularity opto-spintronics

Cite

@article{arxiv.2303.17816,
  title  = {Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES},
  author = {Yuto Fukushima and Kaishu Kawaguchi and Kenta Kuroda and Masayuki Ochi and Hiroaki Tanaka and Ayumi Harasawa and Takushi Iimori and Zhigang Zhao and Shuntaro Tani and Koichiro Yaji and Shik Shin and Fumio Komori and Yohei Kobayashi and Takeshi Kondo},
  journal= {arXiv preprint arXiv:2303.17816},
  year   = {2023}
}

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6 pages, 4 figures

Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES

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