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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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arxiv 2303.17816 v1 pith:ROIDMD7M submitted 2023-03-31 cond-mat.mtrl-sci

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
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Shuntaro Tani Koichiro Yaji Shik Shin Fumio Komori Yohei Kobayashi Takeshi Kondo
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classification cond-mat.mtrl-sci
keywords spin-polarizedstatessurfacetopologicalarpesbandbismuthelemental
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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.

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