Peculiar Rashba Splitting Originating from the Two-Dimensional Symmetry of the Surface

Kazuyuki Sakamoto, Haruya Kakuta, Katsuaki Sugawara, Koji Miyamoto, Akio Kimura, Takuya Kuzumaki, Nobuo Ueno, Emilia Annese, Jun Fujii, Ayaka Kodama, Tatsuya Shishidou, Hirofumi Namatame, Masaki Taniguchi, Takafumi Sato, Takashi Takahashi, and Tamio Oguchi
Phys. Rev. Lett. 103, 156801 – Published 5 October 2009

Abstract

A peculiar Rashba effect is found at a point in the Brillouin zone, where the time-reversal symmetry is broken, though this symmetry was believed to be a necessary condition for Rashba splitting. This finding obtained experimentally by photoemission measurements on a Bi/Si(111)(3×3) surface is fully confirmed by a first-principles theoretical calculation. We found that the peculiar Rashba effect is simply understood by the two-dimensional symmetry of the surface, and that this effect leads to an unconventional nonvortical Rashba spin structure at a point with time-reversal invariance.

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  • Received 20 July 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.156801

©2009 American Physical Society

Authors & Affiliations

Kazuyuki Sakamoto1,*, Haruya Kakuta1, Katsuaki Sugawara2, Koji Miyamoto3, Akio Kimura4, Takuya Kuzumaki1, Nobuo Ueno1, Emilia Annese5, Jun Fujii5, Ayaka Kodama6, Tatsuya Shishidou6, Hirofumi Namatame3, Masaki Taniguchi4, Takafumi Sato7, Takashi Takahashi2,7, and Tamio Oguchi6

  • 1Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan
  • 2WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
  • 4Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
  • 5TASC National Laboratory, INFM-CNR, SS 14, km 163.5, I-34012 Trieste, Italy
  • 6Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
  • 7Department of Physics, Tohoku University, Sendai 980-8578, Japan

  • *kazuyuki_sakamoto@faculty.chiba-u.jp

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Vol. 103, Iss. 15 — 9 October 2009

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