Electromagnetically induced transparency in coupled quantum dot-ring structure under external electric field and donor impurity

The present study seeks to scrutinize the electromagnetically induced transparency of a coupled quantum dot-ring (CQDR). The effects of hydrogenic donor impurity and external electric field on real and imaginary parts of susceptibility are investigated. The Schrödinger equation with parabolic potential is solved by diagonalization method, and the real and imaginary parts of susceptibility in terms of photon energy are calculated using expanding of the density matrix operator. The results show that the susceptibility of coupled quantum dot-ring are affected by electric field, donor impurity and the depth of confinement potential.