Bound excitons in Cu2 O: Efficient internal free exciton detector

J. I. Jang*, Y. Sun, B. Watkins, John B Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We report the spectroscopic observation of bound excitons in natural Cu2 O samples, which are generated by impurity capture of free excitons. Due to the broken symmetry of a bound exciton, its radiative recombination rate increases, causing a greatly enhanced luminescence intensity compared with that for a free exciton. Moreover, the bound exciton luminescence serves as an internal monitor of the free ortho- and free para-exciton densities, whereas the free para-exciton luminescence is allowed only via weak Γ25- phonon emission. At high excitation levels, the bound exciton luminescence shows a density-dependent loss of excitons that is well explained by a recently proposed biexciton formation model. The temperature dependence of the bound ortho- and bound para-exciton luminescence indicates a T-1 -dependence for the exciton-impurity capture rate.

Original languageEnglish (US)
Article number235204
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number23
DOIs
StatePublished - Dec 11 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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