Spin characteristics of excitonic absorption in multiply charged quantum dots

Abstract

The excitonic absorption spectra of negatively charged self-assembled quantum dots as a function of resident electron number (N-e=0-5) are theoretically studied using the configuration interaction method. Spin Pauli blockade, Coulomb (exchange and correlation) interactions, and symmetry of dot shape are identified as the three main underlying mechanisms, sensitively depending on N-e, in the spin characteristic spectra. In particular, we predict that polarized absorption in triply charged dots exhibits anomalous spin-dependent features, resulting from the intrinsic correlations in charged exciton X-3.