title: Nonvortical Rashba Spin Structure on a Surface with C_{1h} Symmetry.
abstract: A totally anisotropic peculiar Rashba-Bychkov (RB) splitting of electronic bands was found on the Tl/Si(110)-(1×1) surface with C_{1h} symmetry by angle- and spin-resolved photoelectron spectroscopy and first-principles theoretical calculation. The constant energy contour of the upper branch of the RB split band has a warped elliptical shape centered at a k point located between Γ[over ¯] and the edge of the surface Brillouin zone, i.e., at a point without time-reversal symmetry. The spin-polarization vector of this state is in-plane and points almost the same direction along the whole elliptic contour. This novel nonvortical RB spin structure is confirmed as a general phenomenon originating from the C_{1h} symmetry of the surface.
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.|Elettra Synchrotron S.C.p.A Trieste, SS 14, km 163.5, I-34149 Trieste, Italy.
authors.forename: Emilia
authors.initials: E
authors.lastname: Annese
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Kuzumaki
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Beate
authors.initials: B
authors.lastname: Müller
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Yamamoto
authors.affiliation: Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan.
authors.forename: Hiroto
authors.initials: H
authors.lastname: Nakano
authors.affiliation: Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan.
authors.forename: Haruki
authors.initials: H
authors.lastname: Kato
authors.affiliation: Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Araki
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Ohtaka
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Aoki
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Ishikawa
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hayashida
authors.affiliation: MAX-lab, Lund University, Box 118, S-22100 Lund, Sweden.
authors.forename: Jacek R
authors.initials: JR
authors.lastname: Osiecki
authors.affiliation: Hiroshima Synchrotron Radiation Centre, Hiroshima University, Higashi-Hiroshima 739-0046, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Miyamoto
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Takeichi
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan.
authors.forename: Ayumi
authors.initials: A
authors.lastname: Harasawa
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Yaji
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan.
authors.forename: Tetsuroh
authors.initials: T
authors.lastname: Shirasawa
authors.affiliation: National Institute for Materials Science, Ibaraki 305-0044, Japan.
authors.forename: Koh-Ichi
authors.initials: K
authors.lastname: Nittoh
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 790-784, Korea.|Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Wooil
authors.initials: W
authors.lastname: Yang
authors.affiliation: National Institute for Materials Science, Ibaraki 305-0044, Japan.
authors.forename: Kazushi
authors.initials: K
authors.lastname: Miki
authors.affiliation: Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan.
authors.forename: Tatsuki
authors.initials: T
authors.lastname: Oda
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 790-784, Korea.|Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Han Woong
authors.initials: HW
authors.lastname: Yeom
authors.affiliation: Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan.|Molecular Chirality Research Center, Chiba University, Chiba 263-8522, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Sakamoto