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Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 5: Electron and spin dynamics I

O 5.4: Talk

Monday, March 22, 2010, 12:00–12:15, H34

One- and two-photon photoemission from Si(100) — •Thomas Fauster1, Shin’ichiro Tanaka2, and Katsumi Tanimura21Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91058 Erlangen, Germany — 2The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

One- and two-photon photoelectron spectra with the same total photon energy should give information on the same initial and final states. Differences show the influence of intermediate states in two-photon photoemission (2PPE). Of particular interest are bulk bands where the conservation of perpendicular momentum leads to peak shifts, resonances and peak narrowing [1,2].

We have measured one- and two-photon photoemission from Si(100)(2×1) in normal emission using frequency-quadrupled and -doubled femtosecond laser radiation with a total photon energy around 6 eV for s- and p-polarized light incident at 45. Differences and common features in the various spectra are analyzed and discussed.

[1] Schattke et al., Phys. Rev. B 78, 155314 (2008).

[2] Pontius et al., Phys. Rev. B 72, 115105 (2005).


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