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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 57.8: Vortrag
Donnerstag, 26. März 2009, 17:45–18:00, HSZ 02
Spin restrictions in the electron interference process on Bi(110) — •Anna Strozecka1, Asier Eiguren2, and Jose Ignacio Pascual1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 Donostia/San Sebastian, Spain
The surfaces of bismuth can be viewed as a quasi-two-dimensional metal with unique spin properties [1]. The strong spin-orbit interaction and the lack of the symmetry on the surface results in the splitting of the surface state bands with respect to the spin direction. The lack of the spin degeneracy strongly affects the quasiparticle interference [2]. We have studied in detail the interference patterns on Bi(110) surface by means of scanning tunneling microscopy. The observed patterns do not reflect directly the shape of the Fermi contour, as it is usually found for metals, but result from the spin-conserving scattering process. The investigation of the energy dependence of the interference reveals that at the energies away from the Fermi level highly anisotropic patterns arise. The origin of theses new scattering events can be established by analyzing the dispersion of the spin split bands. The interpretation of the data is supported by spin-resolved DFT simulations.
[1] Ph. Hofmann, Prog. Surf. Sci. 81, 191 (2006)
[2] J. I. Pascual et. al., Phys. Rev. Lett. 93, 196802 (2004)