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.
@article{arxiv.0709.1773,
title = {Deformation potential dominated phonons in ZnS quantum dots},
author = {S. Dhara and A. K. Arora and Jay Ghatak and K. H. Chen and C. P. Liu and L. C. Chen and Y. Tzeng and Baldev Raj},
journal= {arXiv preprint arXiv:0709.1773},
year = {2008}
}