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Published June 8, 1997 | Published
Journal Article Open

Theory of size-dependent resonance Raman intensities in InP nanocrystals


The resonance Raman spectrum of InP nanocrystals is characterized by features ascribable to both longitudinal (LO) and transverse (TO) optical modes. The intensity ratio of these modes exhibits a strong size dependence. To calculate the size dependence of the LO and TO Raman cross sections, we combine existing models of Raman scattering, the size dependence of electronic and vibrational structure, and electron vibration coupling in solids. For nanocrystals with a radius >10 Å, both the LO and TO coupling strengths increase with increasing radius. This, together with an experimentally observed increase in the electronic dephasing rate with decreasing size, allows us to account for the observed ratio of LO/TO Raman intensities.

Additional Information

© 1997 American Institute of Physics. Received 4 December 1996; accepted 3 March 1997. The experimental data discussed here were obtained with the support of U.S. Department of Energy under Contract No. DE-AC03-76SF00098 and by the Office of Navel Research, Order No. N00014-95-F-0099. The theoretical calculations were supported by a NSF-NYI grant. J.R.H. gratefully acknowledges the David and Lucile Packard Foundation for their support.

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