Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Focused Session: Spin-Orbit Interaction at Surfafces: From the Rashba Effect to Topological States of Matter II
O 57.7: Vortrag
Donnerstag, 26. März 2009, 17:15–17:30, HSZ 02
Bi(114): A quasi one-dimensional metal with strong spin-orbit splitting — •Philip Hofmann1, Justin Wells1,2, Hugo Dil3,4, Fabian Meier3,4, Jorge Lobo-Checa3,4, Vladimir Petrov5, Jürg Osterwalder3, Miguel Moreno Ugeda6, Isabel Fernandez-Torrente6, Jose Ignacio Pascual6, Emile Rienks1, and Maria Fuglsang Jensen1 — 1University of Aarhus, DK — 2University of Science and Technology, Trondheim, N — 3Universität Zürich-Irchel, CH — 4Paul Scherrer Institut, CH — 5St. Petersburg Technical University, RU — 6Freie Universität Berlin, D
The (114) vicinal surface of the semimetal Bi is found to support a quasi one-dimensional, metallic surface state. As required by symmetry, the state is degenerate along the Γ−Ȳ line of the surface Brillouin zone with a highest binding energy of ≈100 meV. In the Γ−X direction the degeneracy is lifted by the strong spin-orbit interaction, as directly shown by spin-resolved photoemission. This results in a Fermi surface consisting of two closely separated, paralell lines of opposite spin direction. We discuss these findings in the light of the recently discovered topological stability of surface states on BiSb topological insulators.