Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 38: Semiconductor substrates: clean surfaces
O 38.1: Talk
Tuesday, March 23, 2010, 15:00–15:15, H40
Angle-resolved low-energy photoemission at clean Si(111)(7x7) surface — •Wolfgang Heckel, Kerstin Biedermann, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen
Former experiments on Si(111)(7x7) have shown the existence of three filled surface states below the Fermi level [1].
For a detailed investigation of these states we carried out angle-resolved photoemission experiments (ARUPS) with high energy and momentum resolution at a photon energy of 6.20 eV using the fourth harmonic from a Ti-sapphire laser. The light was incident at an angle of 80∘ relative to the surface normal so states of Λ1 and Λ3 symmetry could be distinguished unambiguously by switching the light polarisation between p and s. All measurements were undertaken under flat band condition at 90 K.
Several new bands are identified and their dispersion along the ΓM and ΓK symmetry lines is presented.
[1] R. I. G. Uhrberg et al., Phys. Rev. B 58, R1730 (1998)