Electronic states in core-shell quantum rings

We compare energy levels, carrier localization and optical absorption of a single electron and a pair of interacting carriers confined in a hexagonal quantum ring. We show that many-body levels are multiple degenerate and, contrary to the single-particle case, no repeated energy sequence can be identified. The number of eigenvalues associated with corner-localized probability distributions increases with the number of particles. In both the cases that we analyzed, the largest values of absorption coefficients correspond to transitions in the corner-localized domain.