Population inversion in quantum dot ensembles via adiabatic rapid passage

Abstract

Electrical detection of adiabatic rapid passage (ARP) in quantum dot ensembles is explored by extension of a simple physical model. We include exciton and biexciton states and model the current flow into the external circuit which occurs following ionization of the exciton and tunneling of the separate carriers. The inversion produced by ARP is robust with respect to fluctuations in coupling and detuning, and we show directly that this manifests itself as only minor variation in the current drawn per dot, as the number of dots in an ensemble is increased. This approach therefore can provide a means of initializing many dots simultaneously into a specific excited state.