Hole character and photon polarization switching in quantum dot-in-dots and Quantum Dot Molecules

This study proposes and theoretically demonstrates dynamic switching of hole-character and polarization induced by applying an electric field on pyramidal GaAs/AlGaAs dot-in-dots (DiDs) and AlGaAs quantum dot molecules (QDMs). Results show that it is possible to separately confine the electron state and the hole states such that the holes are confined in thinner low-potential regions. The electric fields required for such switching are then calculated for a variety of DiD and QDM configurations, showing that realistic values of less than 105 V/cm are sufficient for inducing the switching. The fabrication of such structures are also discussed.