Decay and coherence of two-photon excited yellow ortho-excitons in Cu2O

Details Decay and coherence of two-photon excited yellow ortho-excitons in Cu2O Decay and coherence of two-photon excited yellow ortho-excitons in Cu2O

2005-05-15

arxiv.org/abs/cond-mat/0505368v1

Physical Review B72, 155201 (2005).

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 12 figures

Scientific paper

10.1103/PhysRevB.72.155201

Photoluminescence excitation spectroscopy has revealed a novel, highly efficient two-photon excitation method to produce a cold, uniformly distributed high density excitonic gas in bulk cuprous oxide. A study of the time evolution of the density, temperature and chemical potential of the exciton gas shows that the so called quantum saturation effect that prevents Bose-Einstein condensation of the ortho-exciton gas originates from an unfavorable ratio between the cooling and recombination rates. Oscillations observed in the temporal decay of the ortho-excitonic luminescence intensity are discussed in terms of polaritonic beating. We present the semiclassical description of polaritonic oscillations in linear and non-linear optical processes.

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