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Direct observation of spin-layer locking by local Rashba effect in monolayer semiconducting PtSe2 film

Author

Listed:
  • Wei Yao

    (Tsinghua University)

  • Eryin Wang

    (Tsinghua University)

  • Huaqing Huang

    (Tsinghua University)

  • Ke Deng

    (Tsinghua University)

  • Mingzhe Yan

    (Tsinghua University)

  • Kenan Zhang

    (Tsinghua University)

  • Koji Miyamoto

    (Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University)

  • Taichi Okuda

    (Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University)

  • Linfei Li

    (Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Yeliang Wang

    (Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter)

  • Hongjun Gao

    (Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter)

  • Chaoxing Liu

    (The Pennsylvania State University)

  • Wenhui Duan

    (Tsinghua University
    Collaborative Innovation Center of Quantum Matter)

  • Shuyun Zhou

    (Tsinghua University
    Collaborative Innovation Center of Quantum Matter)

Abstract

The generally accepted view that spin polarization in non-magnetic solids is induced by the asymmetry of the global crystal space group has limited the search for spintronics materials mainly to non-centrosymmetric materials. In recent times it has been suggested that spin polarization originates fundamentally from local atomic site asymmetries and therefore centrosymmetric materials may exhibit previously overlooked spin polarizations. Here, by using spin- and angle-resolved photoemission spectroscopy, we report the observation of helical spin texture in monolayer, centrosymmetric and semiconducting PtSe2 film without the characteristic spin splitting in conventional Rashba effect (R-1). First-principles calculations and effective analytical model analysis suggest local dipole induced Rashba effect (R-2) with spin-layer locking: opposite spins are degenerate in energy, while spatially separated in the top and bottom Se layers. These results not only enrich our understanding of the spin polarization physics but also may find applications in electrically tunable spintronics.

Suggested Citation

  • Wei Yao & Eryin Wang & Huaqing Huang & Ke Deng & Mingzhe Yan & Kenan Zhang & Koji Miyamoto & Taichi Okuda & Linfei Li & Yeliang Wang & Hongjun Gao & Chaoxing Liu & Wenhui Duan & Shuyun Zhou, 2017. "Direct observation of spin-layer locking by local Rashba effect in monolayer semiconducting PtSe2 film," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14216
    DOI: 10.1038/ncomms14216
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    Cited by:

    1. Oliver J. Clark & Oliver Dowinton & Mohammad Saeed Bahramy & Jaime Sánchez-Barriga, 2022. "Hidden spin-orbital texture at the $$\overline{{{\Gamma }}}$$ Γ ¯ -located valence band maximum of a transition metal dichalcogenide semiconductor," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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