Cavity-photon contribution to the effective interaction of electrons in parallel quantum dots

Vidar Gudmundsson, Anna Sitek, Nzar Rauf Abdullah, Chi-Shung Tang, Andrei Manolescu

Published 2015-05-12Version 1

A single cavity photon mode is expected to modify the Coulomb interaction of an electron system in the cavity. Here we investigate this phenomena in a parallel double quantum dot system. We explore properties of the closed system and the system after it has been opened up for electron transport. We show how results for both cases tend to support the idea that the effective electron-electron interaction becomes more repulsive in the presence of a cavity photon field. This can be understood in terms of a slight, but nontrivial delocalization or polarization of the electrons from the double dot potential, caused by the cavity photons. In addition, we find that the effective repulsion of the electrons can be reduced by quadrupolar collective oscillations excited by an external classical dipole electric field.