title: Giant out-of-plane spin component and the asymmetry of spin polarization in surface Rashba states of bismuth thin film.
abstract: We have performed high-resolution spin- and angle-resolved photoemission spectroscopy of bismuth thin film on Si(111) to investigate the spin structure of surface states. Unlike the conventional Rashba splitting, the magnitude of the in-plane spin polarization is asymmetric between the two elongated surface hole pockets across the zone center. Moreover, we uncovered a giant out-of-plane spin polarization as large as the in-plane counterpart which switches the sign across the Γ-M line. We discuss the present finding in terms of the symmetry breaking and the many-body effects.
authors: Department of Physics, Tohoku University, Sendai, Japan.
authors: A
authors: A
authors: Takayama
authors: T
authors: T
authors: Sato
authors: S
authors: S
authors: Souma
authors: T
authors: T
authors: Takahashi