Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Spin-orbit interaction
O 18.6: Vortrag
Montag, 26. März 2012, 17:15–17:30, A 060
Three-Dimensional Spin Rotations at the Fermi Surface of the Metallic Surface System Au/Ge(111) — •Philipp Höpfner1, Jörg Schäfer1, Andrzej Fleszar2, Jan Hugo Dil3,4, Bartosz Slomski3,4, Werner Hanke2 und Ralph Claessen1 — 1Experimentelle Physik 4, Universität Würzburg — 2Theoretische Physik 1, Universität Würzburg — 3Swiss Light Source, Villigen PSI, Switzerland — 4Physik-Institut, Universität Zürich, Switzerland
Adatom-induced (√3 × √3)-reconstructions at semiconductor surfaces have attracted significant scientific interest in the past. This is due to the manifold of intriguing low-dimensional properties contained therein, ranging from correlated Mott-Hubbard physics to superconducting surface states. Moreover, as a result of space inversion symmetry-breaking at the solid-vacuum interface, a Rashba-type spin-orbit coupling may lead to a lift of the spin degeneracy in the surface states. A significant spin-splitting in metallic surface states at a semiconductor surface would offer the perspective to manipulate spins electronically.
Here, we present a fully three-dimensional analysis of the spin-properties in the metallic surface system Au/Ge(111) by both spin-resolved photoelectron spectroscopy and advanced density-functional modeling. Contrary to a conventional Rashba situation, the spin texture exhibits strong out-of-plane spin components following a threefold symmetry. Moreover, the observation of additional radial spin components shows the complexity of the spin-orbit interaction in Au/Ge(111), and reveals an interplay with Dresselhaus-like spin-orbit effects as a result of the crystalline anisotropies.