Abstract
We resolve a paradox according to which optical transitions seemingly forbidden in PbSe nanocrystal quantum dots by the parity selection rule exhibit large oscillator strengths in optical absorption. The transitions become allowed if the center of a spherical nanocrystal is shifted away from an atomic site leading to the structure inversion asymmetry. This asymmetry is accounted for within a four-band envelope-function formalism. Transition strengths for various optical transitions are calculated.
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