Presentation Information
[1P24]Electronic band structure of Bi/Si(111)-β investigated by momentum microscope
*Yuya Tsuruta1,2, Shunsuke Tsuda1, Shingo Takezawa1,3, Titao Chen1,4, Satoru Ichinokura1, Naoka Nagamura1,3, Takashi Uchihashi1,4, Taichiro Nishio2, Koichiro Yaji1,5 (1. National Institute for Materials Science, 2. Graduate School of Science, Tokyo University of Science, 3. Graduate School of Advanced Engineering, Tokyo University of Science, 4. Hokkaido University, 5. Unprecedented-scale Data Analytics Center, Tohoku University)
In Bi/Si(111)-β, the breaking of inversion symmetry at the surface combined with strong spin–orbit coupling is known to induce a giant Rashba splitting in the electronic states, which have, however, been considered semiconducting in nature. In this study, we employ a momentum microscope with a 10.9 eV laser to investigate the electronic structure across the entire surface Brillouin zone of Bi/Si(111)-β. As a result, we find a metallic surface electronic state. Furthermore, spin-resolved photoemission spectroscopy reveals the spin polarization of the band.