Size dependence of the bulk and surface phonon modes of gallium arsenide nanowires as measured by Raman Spectroscopy

Details Size dependence of the bulk and surface phonon modes of gallium arsenide nanowires as measured by Raman Spectroscopy Size dependence of the bulk and surface phonon modes of gallium arsenide nanowires as measured by Raman Spectroscopy

2008-04-23

arxiv.org/abs/0804.3713v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1088/0957-4484/19/43/435704

Gallium arsenide nanowires were synthesized by gallium-assisted molecular beam epitaxy. By varying the growth time, nanowires with diameters ranging from 30 to 160 nm were obtained. Raman spectra of the nanowires ensembles were measured. The small line width of the optical phonon modes agree with an excellent crystalline quality. A surface phonon mode was also revealed, as a shoulder at lower frequencies of the longitudinal optical mode. In agreement with the theory, the surface mode shifts to lower wave numbers when the diameter of the nanowires is decreased or the environment dielectric constant increased.

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