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Equilibrium and non‐equilibrium optical properties of MoSI nanowires
Author(s) -
Gadermaier C.,
Kusar P.,
Vengust D.,
Vilfan I.,
Mihailovic D.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200776110
Subject(s) - nanowire , absorbance , femtosecond , spectroscopy , materials science , spectral line , absorption spectroscopy , reflection (computer programming) , density functional theory , absorption (acoustics) , thin film , molecular physics , condensed matter physics , optics , optoelectronics , nanotechnology , physics , quantum mechanics , laser , composite material , computer science , programming language
The optical absorbance of oriented Mo 6 S 3 I 6 nanowire thin films is measured and compared to spectra calculated using density functional theory. The expected sharp Van Hove singularities in the optical absorption spectra are not observed, partly because of the large density of interpenetrating electron sub‐bands and partly due to damping and disorder. Using femtosecond pump–probe spectroscopy we have measured the reflection of an optical pulse from a propagating acoustical disturbance in a randomly formed Mo 6 S 3 I 6 nanowire network. This allows us to determine the sound velocity in a highly damped medium, which is not measurable by other techniques. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)