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Peculiar two-dimensional spin-polarized electronic states on solid surfaces
Kazuyuki Sakamoto
Dept. Nanomaterials Science, Chiba University, Chiba 263-8522, Japan
In a 2D system such as a crystal surface, the spin-orbit coupling lifts the degeneracy of electronic states with opposite spin orientations. This Rashba-Bychkov (RB) effect [1] is a novel exotic low-dimensional solid-state property resulting from the space inversion symmetry breaking in the direction perpendicular to the 2D plane. In this talk, I first present peculiar RB effects that originate from the symmetry of the surface [2,3], and then results on RB systems with peculiar spin structures where the backscattering of electron spin with a non-magnetic impurity are considerably suppressed [4]. I will also show novel doping mechanism on Bi2Se3, a topological insulator with 2D spin-polarized electronic states.
[1] Y.A. Bychkov & E.I. Rashba, JETP Lett. 39, 78 (1984).
[2] K. Sakamoto et al., PRL 102, 096805 (2009).
[3] K. Sakamoto et al., PRL 103, 156801 (2009).
[4] K. Sakamoto et al., Nature Comm. 4, 2073 (2013).