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O: Fachverband Oberflächenphysik

O 48: Focused Session: Spin-Orbit Interaction at Surfafces: From the Rashba Effect to Topological States of Matter I

O 48.7: Vortrag

Donnerstag, 26. März 2009, 12:45–13:00, HSZ 02

Unconventional Fermi surface spin patterns in the (Bi/Pb/Sb)/Ag(111) surface alloy — •Fabian Meier^{1, 2}, Vladimir Petrov³, Luc Patthey², Jürg Osterwalder¹, and Hugo Dil^{1, 2} — ¹Physik Institut Universität Zürich, CH — ²Swiss Light Source PSI, CH — ³Physics Institute St Petersburg, RU

By a controllable change in the stoichiometry of the long range ordered mixed surface alloy (Bi/Pb/Sb)/Ag(111) the Rashba and Fermi energy can be tuned over a wide range. We show by spin and angle-resolved photoemission spectroscopy that the spin structure of the individual surface state bands remain unaffected despite the random intermixing of the adatoms. We further report on the observation of unconventional Fermi surface spin textures. These spin textures are found when the Fermi energy lies between the crossing point and the apex of the Rashba type Kramer’s pair. The results will be discussed in the context of spin transport.