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O: Fachverband Oberflächenphysik
O 8: Electronic Structure and Spin-Orbit Interaction I
O 8.2: Vortrag
Montag, 31. März 2014, 10:45–11:00, GER 38
Spin-flip scattering in the surface bands of BiAg2/Ag(111) — •Gustav Bihlmayer1, Lydia El-Kareh2, Matthias Bode2, and Stefan Blügel1 — 1Peter Grünberg Institut and Institute of Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany — 2Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Since its discovery, the surface alloy BiAg2/Ag(111) has attracted
considerable attention due to the ’giant Rashba’ splitting in the occupied
surface bands. Recently, also the unoccupied part of the spectrum was
investigated by scanning tunneling microscopy. But, although theory predicted
a rather complex spin-texture of these bands [1], the quasiparticle interference
patterns seem compatible with a conventional Rashba-type spin-polarization
of these bands [2].
Close examination of the spin- and orbital resolved bandstructures obtained by
density functional theory show, that the orbital structure allows spin-flip
scattering processes that can reconcile experimental evidence with theoretical
predictions.
Our calculations and experiments show that this behavior is not only characteristic
for the Bi-based surface alloy, also in the PbAg2/Ag(111) system these
spin-flip scattering events are observed. The same mechanism also blocks
quasiparticle interference in forward scattering, while other scattering events
are explicitly forbidden by time-reversal symmetry.
G. Bihlmayer et al., Phys. Rev. B 75, 195414 (2007)
L. El-Kareh et al., Phys. Rev. Lett. 110, 176803 (2013)