Observation of Peculiar Rashba-Type Spin-Split Band on Bi(111) Surface by High-Resolution Spin- and Angle-Resolved Photoemission Spectroscopy

• Miyahara Hirokazu

  Graduate School of Science, Hiroshima University, Japan

• Maegawa Takamasa

  Graduate School of Science, Hiroshima University, Japan

• Kuroda Kenta

  Graduate School of Science, Hiroshima University, Japan

• Kimura Akio

  Graduate School of Science, Hiroshima University, Japan

• Miyamoto Koji

  Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan

• Namatame Hirofumi

  Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan

• Taniguchi Masaki

  Graduate School of Science, Hiroshima University, Japan Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan

• Okuda Taichi

  Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan

Abstract

Spin polarized surface states of Bi(111) film fabricated on Si(111) surface have been investigated by means of high-resolution spin-resolved photoemission spectroscopy. In contrast to the Rashba-type spin-split ideal two-dimensional electron gas in which the spin orientation is locked in-plane and tangential to the electron momentum, significant out-of-plane spin polarization has been observed in the surface states which are forming the hole pocket. The out-of-plane spin polarization is anti-symmetric with respect to Γ-M line and vanishes at the line suggesting that the out-of-plane polarization is derived from the three-fold symmetry of the Bi crystal. The magnitude of the out-of-plane spin components depends on the condition of Bi film fabrication, which is consistent with the recent x-ray diffraction results suggesting the existence of double domains rotating 180° each other on the Bi(111) film grown on Si(111) surface. [DOI: 10.1380/ejssnt.2012.153]

Journal

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 10 (0), 153-156, 2012

  The Japan Society of Vacuum and Surface Science

Keywords

• Spin and angle resolved photoemission
• Bismuth
• Metallic films

Details

• CRID: 1390001205186583296
• NII Article ID: 130004438801
• DOI: 10.1380/ejssnt.2012.153
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/10/0/10_0_153/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed