Direct two-photon creation of a biexciton

The nonlinear absorption coefficient for the two-photon creation of biexciton in CuCl is calculated in the approximation of one intermediate, optically active excitonic state. The two-band model with realistic band structure at the band extrema is considered. The exciton–biexciton dipole transition...

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Bibliographic Details
Published in:Solid state communications 2004-03, Vol.129 (11), p.701-705
Main Authors: Ungier, W., Janiszewski, P.
Format: Article
Language:English
Subjects:
A. Semiconductors
Condensed matter: electronic structure, electrical, magnetic, and optical properties
D. Optical properties
Electron states
Exact sciences and technology
Excitons and related phenomena
General theory
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Physics
Theory, models, and numerical simulation
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Summary:The nonlinear absorption coefficient for the two-photon creation of biexciton in CuCl is calculated in the approximation of one intermediate, optically active excitonic state. The two-band model with realistic band structure at the band extrema is considered. The exciton–biexciton dipole transition momentum matrix element is expressed by the functional of the exciton and biexciton envelopes. In the numerical calculations the envelope of the Hylleraas–Ore type, modified by Brinkman et al., is used. Our calculated value of the absorption coefficient is about two orders of magnitude smaller than that estimated previously by Hanamura, and agrees better with the experimental value reported by Gale and Mysyrowicz.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2003.12.023