Theory of exciton doublet structures and polarization relaxation in single quantum dots

T. Takagahara

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

The mechanism of exciton doublet structures in quantum dots is identified as the long-range part of the electron-hole exchange interaction which is emphasized by the anisotropic shape of quantum dots. The physical origin of the energetic order of the orthogonally polarized exciton states of each doublet is clarified by inspecting the spatial distribution of the exciton polarization. The key concepts to understand the energetic order are the node configuration of the distribution function of exciton polarization and the dipole-dipole interaction energy originating from the long-range electron-hole exchange interaction. The population relaxation and the polarization relaxation of excitons are studied and the extremely slow polarization relaxation within exciton doublet states is predicted. It is also found that the inter-doublet cross-relaxation between orthogonally polarized exciton states occurs as efficiently as the population relaxation.

Original languageEnglish
Pages (from-to)16840-16855
Number of pages16
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number24
DOIs
Publication statusPublished - 2000 Dec 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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