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

Research output: Contribution to journalArticle

206 Citations (Scopus)

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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