Article Spin-polarized saddle points in the topological surface states of elemental bismuth revealed by pump-probe spin- and angle-resolved photoemission spectroscopy

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

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Yuto Fukushima, Kaishu Kawaguchi, Kenta Kuroda, Masayuki Ochi, Motoaki Hirayama, Ryo Mori, 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 elemental bismuth revealed by pump-probe spin- and angle-resolved photoemission spectroscopy. Physical Review B. 2024, 110 (4), L041401. https://doi.org/10.1103/physrevb.110.l041401
SAMURAI

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(abstract)

We use a pomp-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 (Z2=1) against the prediction of most band calculations. Furthermore, we unveil that the unoccupied topological surface states possess spin-polarized saddle points yielding van Hove singularity, providing an excellent platform for the future development of opto-spintronics.

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Keyword: Photoemission spectroscopy, Topological surface state, Bismuth

Date published: 2024-07-01

Publisher: American Physical Society (APS)

Journal:

  • Physical Review B (ISSN: 24699950) vol. 110 issue. 4 L041401

Funding:

  • Kao Foundation for Arts and Sciences
  • Japan Society for the Promotion of Science JP21H04439
  • Japan Society for the Promotion of Science JP21H04652
  • Japan Society for the Promotion of Science JP23K13041
  • Ministry of Education, Culture, Sports, Science and Technology JPMXS0118068681

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4574

First published URL: https://doi.org/10.1103/physrevb.110.l041401

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Updated at: 2024-07-08 09:33:57 +0900

Published on MDR: 2024-07-04 16:30:20 +0900

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