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/content/aip/journal/adva/6/1/10.1063/1.4941072
2016-01-27
2016-09-25

Abstract

We discuss the impact of free carriers on the zone-center optical phonon frequency in germanium(Ge). By taking advantage of the Ge-on-insulator structure, we measured the Raman spectroscopy by applying back-gate bias. Phonon softening by accumulating holes in Ge film was clearly observed. This fact strongly suggests that the phonon softening in heavily-doped Ge is mainly attributed to the free carrier effect rather than the dopant atom counterpart. Furthermore, we propose that the free carrier effect on phonon softening is simply understandable from the viewpoint of covalent bonding modification by free carriers.

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