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 57.4: Vortrag
Donnerstag, 26. März 2009, 16:30–16:45, HSZ 02
Rashba type spin-orbit splitting of quantum well states in ultrathin Pb films — •Hugo Dil1,2, Fabian Meier1,2, Jorge Lobo-Checa3, Luc Patthey2, Gustav Bihlmayer4, and Jürg Osterwalder1 — 1Universität Zürich, CH — 2Swiss Light Source, CH — 3Universität Basel, CH — 4Forschungszentrum Jülich, D
When the thickness of a metal layer approaches the electron coherence length, quantum well states (QWS) may form in the layer. It has been shown previously that QWS may show a spin splitting due to hybridization with interface[1] or surface states[2], which either decays with layer thickness or is sensitive to contamination. Here we will report the first observation of an intrinsic Rashba type spin-orbit splitting in metallic QWS by spin and angle-resolved photoemission[3]. The resulting band splitting is too small to be detected by spin integrated ARPES and highlights the possibilities of state-of-the-art spin resolved ARPES. It will be shown that the spin-orbit interaction takes place throughout the whole layer, but that the necessary asymmetry is induced by the two interfaces of the film. This opens up the possibility to manipulate the effect by interface engineering.
[1] C. Koitzsch et al. PRL 95, 126401 (2005)
[2] K. He et al. PRL 101, 107604 (2008); E. Frantzeskakis et al. PRL 101, 196805 (2008)
[3] H. Dil et al. PRL in press