title: Abrupt rotation of the Rashba spin to the direction perpendicular to the surface.
abstract: The polarization vector of the Rashba spin, which must be parallel to the two-dimensional (2D) plane in an ideal system, is found to change abruptly and definitely to the direction perpendicular to the surface at the K point of the Brillouin zone of a real hexagonal system, the Tl/Si(111)-(1x1) surface. This finding obtained experimentally by angle-resolved and spin-resolved photoemission measurements is fully confirmed by a first-principles theoretical calculation. We found that the abrupt rotation of the Rashba spin is simply understood by the 2D symmetry of the hexagonal structure.
authors.affiliation: Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan. kazuyuki_sakamoto@faculty.chiba-u.jp
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Tatsuki
authors.initials: T
authors.lastname: Oda
authors.forename: Akio
authors.initials: A
authors.lastname: Kimura
authors.forename: Koji
authors.initials: K
authors.lastname: Miyamoto
authors.forename: Masahito
authors.initials: M
authors.lastname: Tsujikawa
authors.forename: Ayako
authors.initials: A
authors.lastname: Imai
authors.forename: Nobuo
authors.initials: N
authors.lastname: Ueno
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Namatame
authors.forename: Masaki
authors.initials: M
authors.lastname: Taniguchi
authors.forename: P E J
authors.initials: PE
authors.lastname: Eriksson
authors.forename: R I G
authors.initials: RI
authors.lastname: Uhrberg