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

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 and Shuyun Zhou ()
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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
Hongjun Gao: Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences
Chaoxing Liu: The Pennsylvania State University
Wenhui Duan: Tsinghua University
Shuyun Zhou: Tsinghua University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms14216

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