Deformation potential dominated phonons in ZnS quantum dots

Details Deformation potential dominated phonons in ZnS quantum dots Deformation potential dominated phonons in ZnS quantum dots

2007-09-12

arxiv.org/abs/0709.1773v2

Physics

Optics

14 pages, 4 figures, Submitted in Journal

Scientific paper

Strong deformation potential (DP) dominated Raman spectra are reported for quantum confined cubic ZnS nanoclusters under off-resonance conditions allowed only in quantum dots. A flurry of zone boundary phonons is demonstrated in the scattering process. Transverse optic (TO) mode in the multi-phonon process shows only even order overtones suggesting the dominance of a two-phonon process (having large DP value in ZnS) and its integral multiples. Two-phonon TO modes corresponding to A1 and B2 symmetries are also demonstrated under off-resonance conditions which are allowed only in quantum dots.

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