Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.74: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Electronic Structure and Doping of quasi-1D Ag Nanowires — •Chris Nicholson¹, Claude Monney¹, Ulrich Krieg², Karsten Horn¹, and Martin Wolf¹ — ¹Abteilung PC, Fritz-Haber-Institut der MPG, Faradayweg 4-6, 10825 Berlin — ²Institut für Festkörperphysik, Leibniz Universität, Appelstraße 2 , 30167 Hannover

Control over the electronic properties in nanoscale structures is an area which has both fundamental and technological importance. Self-assembled systems of metals on semiconducting substrates offer a versatile and tuneable environment within which such control can be achieved. Ag nanowires grown on a vicinal Si substrate, Si(557), at a coverage around 1 monolayer have previously been observed to have a highly anisotropic plasmon dispersion in electron energy loss spectra (EELS) [1], which may be the signal of a 1D electron gas at the surface. Additionally, dosing the surface with additional Ag or residual gas produced a shift of the plasmon frequency as a function of exposure time [2], which is likely to be the filling of the 1D electronic band. We employ angle-resolved photoemission spectroscopy (ARPES) to reveal that the plasmonic behaviour of the AgSi(557) system can be understood in terms of the electron interaction with the vicinal Si substrate. Additionally we show the important role played by residual gas adsorption in filling electronic states at the Fermi level.

[1] Krieg et al. J. Phys. Condens. Matt. 25 (2013) 014013

[2] Krieg et al. New J. Phys 16 0430076 (2014)