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O: Fachverband Oberflächenphysik

O 96: Metallic Nanowires on Semiconductor Surfaces

O 96.10: Vortrag

Donnerstag, 23. März 2017, 17:15–17:30, WIL C107

Infrared Spectroscopy of Charge Carrier Excitation in Metallic Nanowires on the Atomic Scale — •Annemarie Pucci and Fabian Hötzel — Kirchhoff Institute for Physics, Heidelberg University, Germany

Atomic chains, as for example gold superstructures on vicinal silicon surfaces, may show infrared resonances that can be attributed to plasmonic excitations in nanowires of a finite length of the order of 100 nm. The appearance of the resonances clearly indicates the metallic character of the atomic chains. The quantitative analysis of the spectral weight and the resonance position yields the data on the nanowire conductivity and complementary information on the electronic band structure. Conductivity changes upon doping can be directly seen in the infrared spectra. Furthermore, as we have recently found out, the plasmonic resonances are sensitive to the changes of the polarization of the silicon step edges with temperature.