2021 年 64 巻 6 号 p. 275-280
We have investigated the spin structure of photoelectrons emitted from a spin-orbit coupled surface state of Bi2Se3(111). The spin polarization is observed only in the direction perpendicular to the mirror plane with p- and s-polarized lights and is inverted upon switching the light polarization from p to s. On the other hand, the photoexcitation with a circularly polarized light leads to the three-dimensional spin-vector rotation in the final state. This is produced by the spin interference in the photoemission process, resulting from simultaneous excitation of the spin-up and spin-down states coupled to the symmetric and antisymmetric parts of the wave functions respectively.
