Direct observation of spin-layer locking by local Rashba effect in monolayer semiconducting PtSe 2 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, Shuyun Zhou

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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 PtSe 2 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.

Original languageEnglish (US)
Article number14216
JournalNature communications
Volume8
DOIs
StatePublished - Jan 31 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Yao, W., Wang, E., Huang, H., Deng, K., Yan, M., Zhang, K., Miyamoto, K., Okuda, T., Li, L., Wang, Y., Gao, H., Liu, C., Duan, W., & Zhou, S. (2017). Direct observation of spin-layer locking by local Rashba effect in monolayer semiconducting PtSe 2 film. Nature communications, 8, [14216]. https://doi.org/10.1038/ncomms14216