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|
|Pages (from-to)||1 - 3|
|Number of pages||3|
|Journal||Physical Review B: Condensed Matter and Materials Physics|
|Volume||64 (23, 233317)|
|Publication status||Published - Nov 2001|