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Spin-dependent quantum interference in photoemission process from spin-orbit coupled states

Author

Listed:
  • Koichiro Yaji

    (Institute for Solid State Physics, The University of Tokyo)

  • Kenta Kuroda

    (Institute for Solid State Physics, The University of Tokyo)

  • Sogen Toyohisa

    (Institute for Solid State Physics, The University of Tokyo)

  • Ayumi Harasawa

    (Institute for Solid State Physics, The University of Tokyo)

  • Yukiaki Ishida

    (Institute for Solid State Physics, The University of Tokyo)

  • Shuntaro Watanabe

    (Research Institute for Science and Technology, Tokyo University of Science)

  • Chuangtian Chen

    (Beijing Center for Crystal Research and Development, Chinese Academy of Science)

  • Katsuyoshi Kobayashi

    (Ochanomizu University)

  • Fumio Komori

    (Institute for Solid State Physics, The University of Tokyo)

  • Shik Shin

    (Institute for Solid State Physics, The University of Tokyo)

Abstract

Spin–orbit interaction entangles the orbitals with the different spins. The spin–orbital-entangled states were discovered in surface states of topological insulators. However, the spin–orbital-entanglement is not specialized in the topological surface states. Here, we show the spin–orbital texture in a surface state of Bi(111) by laser-based spin- and angle-resolved photoelectron spectroscopy (laser-SARPES) and describe three-dimensional spin-rotation effect in photoemission resulting from spin-dependent quantum interference. Our model reveals that, in the spin–orbit-coupled systems, the spins pointing to the mutually opposite directions are independently locked to the orbital symmetries. Furthermore, direct detection of coherent spin phenomena by laser-SARPES enables us to clarify the phase of the dipole transition matrix element responsible for the spin direction in photoexcited states. These results permit the tuning of the spin polarization of optically excited electrons in solids with strong spin–orbit interaction.

Suggested Citation

  • Koichiro Yaji & Kenta Kuroda & Sogen Toyohisa & Ayumi Harasawa & Yukiaki Ishida & Shuntaro Watanabe & Chuangtian Chen & Katsuyoshi Kobayashi & Fumio Komori & Shik Shin, 2017. "Spin-dependent quantum interference in photoemission process from spin-orbit coupled states," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14588
    DOI: 10.1038/ncomms14588
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    Cited by:

    1. Yoshiyuki Ohtsubo & Toru Nakaya & Takuto Nakamura & Patrick Le Fèvre & François Bertran & Fumitoshi Iga & Shin-Ichi Kimura, 2022. "Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB6(001)," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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