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

Autor:	Fukushima, Yuto, Kawaguchi, Kaishu, Kuroda, Kenta, Ochi, Masayuki, Tanaka, Hiroaki, Harasawa, Ayumi, Iimori, Takushi, Zhao, Zhigang, Tani, Shuntaro, Yaji, Koichiro, Shin, Shik, Komori, Fumio, Kobayashi, Yohei, Kondo, Takeshi
Rok vydání:	2023
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	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. Comment: 6 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2303.17816 Zobrazit plný text záznamu View this record from Arxiv