Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots

Georgi L. Dakovski, Song Lan, Chen Xia, Jie Shan

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Terahertz time-domain spectroscopy was employed to investigate photogenerated excitons in PbSe and CdSe quantum dots (QD) of radii less than their exciton Bohr radius. The exciton response was found to be "atom"-like and rise with increasing the carrier effective mass. Excitons in CdSe were found to be about two times more polarizable than those in PbSe QDs of equal size. These experimental findings including both the magnitude of the exciton polarizability and its variation with the QD radius were well described by an effective mass model with multiband structures of the QD materials.

Original languageEnglish (US)
Pages (from-to)5904-5908
Number of pages5
JournalJournal of Physical Chemistry C
Volume111
Issue number16
DOIs
StatePublished - Apr 26 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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