Development of High-resolution Spin-resolved Photoemission Spectrometer and Its Application for Study of Surface Rashba Effects

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  • 高分解能スピン分解光電子分光装置の開発と表面ラシュバ効果の研究
  • コウブンカイノウ スピン ブンカイ コウデンシ ブンコウ ソウチ ノ カイハツ ト ヒョウメン ラシュバ コウカ ノ ケンキュウ

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Abstract

We have developed an ultrahigh-resolution spin-resolved photoemission spectrometer equipped with a highly efficient mini Mott detector and an intense xenon plasma discharge lamp. Three-dimensional spin-polarization is determined by using a 90o electron deflector situated between the hemispherical electron-energy analyzer and the Mott detector. The spectrometer achieves the energy resolution of 0.9 and 8 meV for non-spin-resolved and spin-resolved modes, respectively. By using the newly developed spectrometer, we have performed spin-and angle-resolved photoemission spectroscopy of bismuth thin film on Si(111) to investigate the spin structure of surface states. Unlike the normal Rashba splitting, the magnitude of the in-plane spin polarization is asymmetric across the zone center between the two elongated surface hole pockets. More surprisingly, we observed a giant out-of-plane spin polarization as large as the in-plane counterpart which switches the sign across the Γ−-M− line. We discuss the present finding in terms of the breaking of time reversal symmetry and the many-body effects.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 33 (3), 165-171, 2012

    The Surface Science Society of Japan

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