Dresden 2006 – scientific programme
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HL: Halbleiterphysik
HL 42: Quantum dots and wires: Preparation and characterization I
HL 42.3: Talk
Thursday, March 30, 2006, 11:30–11:45, POT 51
Thermal conductivity of gases from power-dependent Raman spectroscopy on silicon nanowires — •Harald Scheel1, Stephanie Reich2, Carola Nisse1, and Christian Thomsen1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
The Raman spectra of silicon nanowires are studied as a function of laser excitation power and the molar mass of surrounding gases. We find that the thermal conductivity of a gas determines the nanowire temperature, which can be detected by a change in the Raman frequency. We can thus distinguish different gases by their thermal conductivities.