Abstract
We report high-resolution spin- and angle-resolved photoemission spectroscopy of bismuth thin film on Si(111) to discuss the spin structure of surface states. We found that, unlike conventional picture of the Rashba splitting, the magnitude of the in-plane spin polarization is asymmetric between two hole pockets across the Brillouin-zone center. In addition, these pockets exhibit a giant out-of-plane spin polarization as large as the in-plane counterpart, which changes the sign across the Γ¯ M¯ line. We also revealed that the spin polarization of the Rashba surface states near the Brillouin-zone boundary (the M¯ point) is gradually reduced on decreasing the film thickness. Our result provides a new pathway to generate and control spin-polarized electrons in the Rashba system.
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