Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Semiconductor Substrates: Metallic Nanowires
O 95.8: Vortrag
Freitag, 5. April 2019, 12:15–12:30, H14
Phenomenological assignment of surface phonons at Si(hhk) modified by Au submonolayers — •Julian Plaickner1, Eugen Speiser1, Sandhya Chandola1, Nobert Esser1, Benedikt Halbig2, and Jean Geurts2 — 1Leibniz-Institut für Analytische Wissenschaften-ISAS- e.V. Schwarzschildstrasse 8, 12489 Berlin, Germany — 2Universität Würzburg, Physikalisches Institut, Experimentelle Physik 3 Am Hubland, 97074 Würzburg, Germany
Raman spectroscopy is an extremely sensitive tool for analyzing vibration modes of ordered (sub)monolayers of metal adatoms on semiconductor surfaces, which are typical systems for electron correlation effects. We report on the in situ UHV Raman analysis of self-organized Au submonolayers on nominal Si(111) surfaces, as well as on vicinal Si(553), Si(775), and Si(557). For the two-dimensional Au-(sqrt(3)xsqrt(3)) and the one-dimensional Au-(5x2) reconstructions, several specific Raman peaks in the spectral range below 200 cm-1 are assigned to Au-dominated vibrational modes, while Si-step-edge vibrational modes around 400 cm-1 are fingerprints of the substrate orientation.