Study of entanglement entropy and exchange coupling in two-electron coupled quantum dots

摘要

In the present work, we have studied the electronic properties of two-electron quantum dots with considering a two-dimensional modified Gaussian confinement potential in the presence of an impurity. We have investigated the effects of impurity position and charge of impurity on the entanglement entropy and the exchange coupling of the system. The location and charge screening of the impurity atom modulate the degree of entanglement. According to the results, it is found that the entanglement can be considered in two regions, at low and high entanglement. The magnitude of the charge impurity determines both regions of entanglement.