Breaking the phonon bottleneck in semiconductor nanocrystals via multiphonon emission induced by intrinsic nonadiabatic interactions

Richard D Schaller, Jeffrey M. Pietryga, Serguei V. Goupalov, Melissa A. Petruska, Sergei A. Ivanov, Victor I Klimov

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Abstract

We observe ultrafast 1P-to-1S intraband relaxation in PbSe and CdSe nanocrystals (NCs) that have distinct energy spectra. While ultrafast dynamics in CdSe NCs has typically been interpreted in terms of electron-hole energy transfer, this mechanism is not active in PbSe NCs because of sparse densities of states in the conduction and valence bands. Our observations of temperature activation and confinement-enhanced relaxation in PbSe NCs can be explained by efficient multiphonon emission triggered by nonadiabatic electron-phonon interactions and are indicative of large, size-dependent, intraband Huang-Rhys parameters.

Original languageEnglish
Article number196401
JournalPhysical Review Letters
Volume95
Issue number19
DOIs
Publication statusPublished - Nov 4 2005

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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