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Physical Review Letters

Evidence of the Autoionizing Character of Biexcitons

D. S. Chemla, Alain D. Maruani, Edmond Batifol

Published Apr 16, 1979• 51 citations
Publisher

Abstract

The highly structured profile of the ${\ensuremath{\Gamma}}_{1}$ biexciton level of CuCl is studied experimentally by resonant coherent nonlinear scattering. A theoretical model is presented which accurately describes the ${\ensuremath{\Gamma}}_{1}$ biexciton line shape in terms of a Fano interference, evidencing the autoionizing character of biexcitons.

DOI
10.1103/physrevlett.42.1075

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Experimental and theoretical investigations of the biexciton nonlinearity and bistability in CuCl (A)

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Journal of the Optical Society of America A•Jan 1, 1983•0 citations
The highly structured profile of the \ensuremathΓ1{\ensuremath{\Gamma}}_{1}\ensuremathΓ1​ biexciton level of CuCl is studied experimentally by resonant coherent nonlinear scattering. A theoretical model is presented which accurately describes the \ensuremathΓ1{\ensuremath{\Gamma}}_{1}\ensuremathΓ1​ biexciton line shape in terms of a Fano interference, evidencing the autoionizing character of biexcitons.
Experimental evidence for the occurrence of optical bistability using the biexciton two-photon resonance in CuCl is presented. These observations agree with recent theoretical predictions that require an intensity of 10 MW/cm2{\mathrm{cm}}^{2}cm2 and 10-\ensuremath{\mu}m-thick etalons with 90% reflective coatings. Earlier much less demanding predictions neglected two important physical effects: unsaturable background absorption at the biexciton from the tail of the exciton resonance and broadening of the biexciton resonance with intensity.
We propose an experimental scheme to evaluate the intrinsic anharmonicity of the biexciton ensemble by extending the conventional four-wave mixing technique to coherent biexciton waves, which can be prepared by two-photon absorption of ultrashort optical pulses. The anharmonicity originates from the two-body interaction of the bosonic quasi-particles at low densities and leads to Kerr-type nonlinearity for the coherent biexcitonic waves generated in the crystal. We discuss the feasibility of determining the two-body biexciton interaction energy in CuCl by measuring the anharmonicity of the biexcitonic ensemble.