Title: Long-wavelength, confined optical phonons in InAs nanowires probed by Raman spectroscopy
Authors: Cantoro, Mirco ×
Klekachev, Alexander
Nourbakhsh, Amirhasan
Soree, B
Heyns, Marc
De Gendt, Stefan #
Issue Date: Feb-2011
Publisher: Springer-Verlag Heidelberg
Series Title: European Physical Journal B, Condensed Matter Physics vol:79 issue:4 pages:423-428
Abstract: Strongly confined nano-systems, such as one-dimensional nanowires, feature deviations in their structural, electronic and optical properties from the corresponding bulk. In this work, we investigate the behavior of long-wavelength, optical phonons in vertical arrays of InAs nanowires by Raman spectroscopy. We attribute the main changes in the spectral features to thermal anharmonicity, due to temperature effects, and rule out the contribution of quantum confinement and Fano resonances. We also observe the appearance of surface optical modes, whose details allow for a quantitative, independent estimation of the nanowire diameter. The results shed light onto the mechanisms of lineshape change in low-dimensional InAs nanostructures, and are useful to help tailoring their electronic and vibrational properties for novel functionalities.
ISSN: 1434-6028
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Semiconductor Physics Section
Centre for Surface Chemistry and Catalysis
Molecular Design and Synthesis
× corresponding author
# (joint) last author

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