Spin-Split Quantum-Well States Induced by Hybridization with Rashba-Split Surface States

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  • TAKEICHI Yasuo
    Institute for Solid State Physics, The University of Tokyo Department of Physics, The University of Tokyo
  • HE Ke
    Institute for Solid State Physics, The University of Tokyo Institute of Physics, Chinese Academy of Sciences
  • OKUDA Taichi
    Institute for Solid State Physics, The University of Tokyo Hiroshima Synchrotron Radiation Center, Hiroshima University
  • HIRAHARA Toru
    Department of Physics, The University of Tokyo
  • KAKIZAKI Akito
    Institute for Solid State Physics, The University of Tokyo
  • MATSUDA Iwao
    Institute for Solid State Physics, The University of Tokyo

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Other Title
  • ラシュバ分裂した表面状態との混成により誘起された金属量子井戸状態のスピン分裂
  • ラシュバ ブンレツ シタ ヒョウメン ジョウタイ ト ノ コンセイ ニ ヨリ ユウキ サレタ キンゾク リョウシ イド ジョウタイ ノ スピン ブンレツ

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Abstract

Electronic structure of a Ag(111) quantum film covered with a (√3×√3) R30o Bi/Ag ordered suface alloy, which shows Rashba spin-split surface states, is investigated with high-resolution spin- and angle-resolved photoemission spectroscopy. Quantum well states (QWS) of the Ag film are significantly modified by the interaction with the spin-split surface states (SS). The band dispersion of the QWS forms energy gaps at the crossing points with the SS bands when spins of the QWS and the SS are parallel, while it remains free-electron-like when those spins are anti-parallel. The present results give a direct evidence of breakdown of the spin-degeneracy in the quantum film of a non-magnetic metal by the surface Rashba effect.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 31 (9), 493-499, 2010

    The Surface Science Society of Japan

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