The Radiative Biexciton-exciton Recombination in Wurtzite Crystals |
| W. Ungier Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland |
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| In the effective mass approximation in the two-band model of semiconductor the dipole moment matrix element due to the biexciton-exciton transition is expressed by the functional of the exciton and biexciton envelopes. In comparison to previous estimations of the biexciton-exciton transition probability the detailed band structure at band extrema was taken into account and the biexciton envelope optimized by variational calculation was used in calculations. The oscillator strength ratio I2=fbiex-ex/fband-to-band is given for several values of σ=me/mh. The calculated functional I for CdS is about four times smaller compared to that obtained by Hanamura. The calculated giant oscillator strength of the biexciton-exciton recombination in CdS is fbiex-ex=4×102. |
| DOI: 10.12693/APhysPolA.94.588 PACS numbers: 71.35.-y |