Abstract
A thorough theoretical study has been made on the optical response of an exciton weakly confined in a sphere over a wide range of size, based on the previous work on the exciton level scheme which takes account of electron–hole (e–h) exchange interaction, size quantized center-of-mass (CM) motion, and the effect of background polarization. In the presence of transverse EM field, the cross section of elastically scattered light has been calculated according to a modified microscopic nonlocal response theory. The results allow us a systematic understanding of resonant spectral structure in a wide range of sample size, in relation with the corresponding level scheme, radiative shift and width, and the longitudinal and transverse character of each exciton level.
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