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Sökning: WFRF:(Yaji Koichiro)

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1.
  • Annese, Emilia, et al. (författare)
  • Nonvortical Rashba Spin Structure on a Surface with C1h Symmetry
  • 2016
  • Ingår i: Physical Review Letters. - 0031-9007. ; 117:1
  • Tidskriftsartikel (refereegranskat)abstract
    • A totally anisotropic peculiar Rashba-Bychkov (RB) splitting of electronic bands was found on the Tl/Si(110)-(1×1) surface with C1h symmetry by angle- and spin-resolved photoelectron spectroscopy and first-principles theoretical calculation. The constant energy contour of the upper branch of the RB split band has a warped elliptical shape centered at a k point located between Γ and the edge of the surface Brillouin zone, i.e., at a point without time-reversal symmetry. The spin-polarization vector of this state is in-plane and points almost the same direction along the whole elliptic contour. This novel nonvortical RB spin structure is confirmed as a general phenomenon originating from the C1h symmetry of the surface.
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2.
  • Kobayashi, Takahiro, et al. (författare)
  • Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal
  • 2023
  • Ingår i: Nano Letters. - 1530-6992 .- 1530-6984. ; 23:16, s. 7675-7682
  • Tidskriftsartikel (refereegranskat)abstract
    • The interplay of spin-orbit coupling and crystal symmetry can generate spin-polarized bands in materials only a few atomic layers thick, potentially leading to unprecedented physical properties. In the case of bilayer materials with global inversion symmetry, locally broken inversion symmetry can generate degenerate spin-polarized bands, in which the spins in each layer are oppositely polarized. Here, we demonstrate that the hidden spins in a Tl bilayer crystal are revealed by growing it on Ag(111) of sizable lattice mismatch, together with the appearance of a remarkable phenomenon unique to centrosymmetric hidden-spin bilayer crystals: a novel band splitting in both spin and space. The key to success in observing this novel splitting is that the interaction at the interface has just the right strength: it does not destroy the original wave functions of the Tl bilayer but is strong enough to induce an energy separation.
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