Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.44: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Angular resolved photoemission study of a two-dimensional electron system induced by Cs adsorption on InSb(110). — •Alexander Georgi1, Carola Straßer2, Isabella Gierz3, Stefan Becker1, Marcus Liebmann1, Christian Ast2, and Markus Morgenstern1 — 1II. Physikalisches Institut B and JARA-FIT, RWTH Aachen University, Aachen, Germany — 2Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 3Max Planck Research Department for Structural Dynamics, University of Hamburg, Centre for Free Electron Laser Science, Hamburg, Germany
Using angular resolved photoemission (ARPES) at 70 K, we investigated the band structure of a two-dimensional electron system (2DES) created by Cs adsorption on p-type InSb(110). Cs induces a large band bending on the surface of p-type InSb(110) and creates a 2DES in the inversion layer. ARPES measurements reveal the parabola of the first 2DES subband exhibiting an effective mass of only m*=0.022 m0 in accordance with theory.
The large electric field within the 2DES leads to a large Rashba parameter estimated to be about α = 7 × 10−11eVm. Scanning tunneling spectroscopy studies [1] indeed show a beating pattern in the Landau levels of the system which can be attributed to this Rashba spin splitting. Experiments to probe this spin splitting by ARPES are under way.
[1] S. Becker, Phys. Rev B 81, 155308 (2010)