Observation of exciton-energy renormalization by the biexciton gas in semiconductors

G. Brown, I. J. Blewett, I. Galbraith, A. K. Kar, B. S. Wherrett

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Abstract

Energy renormalization of the excitonic resonance due to pair correlations within the electron gas in semi-conductors is well known. Higher order correlations give rise to quasiparticles such as biexcitons, yet the energy renormalizations associated with a given density of these complexes are unknown. We present ultrafast polarization-selective pump-continuum-probe data which demonstrate that, at high density, interband recombination in wide-gap semiconductors at 4 K is preceded by a phase dominated by biexcitons and that there is a distinct blue-shift of the exciton resonance due to the biexciton gas.

Original languageEnglish
Article number081201
Pages (from-to)812011-812014
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume63
Issue number8
Publication statusPublished - 2001

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    Brown, G., Blewett, I. J., Galbraith, I., Kar, A. K., & Wherrett, B. S. (2001). Observation of exciton-energy renormalization by the biexciton gas in semiconductors. Physical Review B: Condensed Matter and Materials Physics, 63(8), 812011-812014. [081201].