Abstract
GaN columnar nanostructures fabricated by electrochemical dissolution of bulk material have been studied by micro-Raman spectroscopy. The anodization induces an increase in the intensity of Raman scattering accompanied by a breakdown of the polarization selection rules and by the appearance of a new mode at 716 cm-1, i.e., in the frequency gap between the transverse optical and longitudinal optical bulk phonons. We present a Raman line-shape analysis based on the effective dielectric function of a composite that brings to light the Fröhlich character of this mode.
Translated title of the contribution | Fröhlich modes in GaN columnar nanostructures |
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Original language | English |
Pages (from-to) | 1 - 3 |
Number of pages | 3 |
Journal | Physical Review B: Condensed Matter and Materials Physics |
Volume | 64 (23, 233317) |
DOIs | |
Publication status | Published - Nov 2001 |