Abstract
Many of the recent experimental observations on the optical response of semi-conductor microcrystallites involve the biexciton states. In CuCl crystallites, for example, an enhanced third-order nonlinear optical susceptibility (χ(3)) with a saturating size-dependence[1], very large gain for biexcitonic lasing [2], and a blue-shift of the excitonic absorption under a strong pump beam [3] have been observed. A satisfactory understanding of these observations is, however, lacking due to the absence of theoretical calculations of biexcitons in crystallites larger than a few exciton Bohr radius (aex). We present a calculation of the biexcitonic states in spherical microcrystallites with radii (R) up to 10aex, using a novel approach based on an exciton-exciton product state basis.
© 1996 Optical Society of America
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