Suppression of molecule formation for orthoexciton-polaritons in Cu2O

J. I. Jang*, J. B. Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The lifetime of dense orthoexcitons in Cu2O is severely limited by dark molecule formation. In order to investigate this two-body process for orthoexciton-polaritons, we employ two-photon excitation and resonantly create orthoexciton-polaritons at 2 K, which are the coherent quantum superposition of orthoexcitons and the light field. Based on the steady-state analysis, we find that this density-dependent process is an order of magnitude reduced for resonantly created orthoexciton-polaritons compared with thermalized orthoexcitons at 2 K. This most likely arises from the photonic character of an orthoexciton-polariton. Considering the greatly reduced effective mass of the orthoexciton-polariton, this implies that the experimentally achievable orthoexciton-polariton densities can be above the critical density for Bose-Einstein condensation. However, insufficient elastic scattering seems to keep this propagating quantum ensemble from internal equilibrium.

Original languageEnglish (US)
Pages (from-to)128-132
Number of pages5
JournalSolid State Communications
Volume146
Issue number3-4
DOIs
StatePublished - Apr 2008

Keywords

  • D. Orthoexciton-polariton
  • D. Two-body process
  • E. Two-photon excitation

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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