The External Electric and Magnetic Fields Effect on Binding Energy of Hydrogenic Donor Impurity in a InGaAsP/InP Core-Shell Quantum Dot

摘要

In the effective-mass envelope-function theory, we calculate the ground state binding energy of a hydrogenic donor impurity in a core-shell quantum dot through the plane wave basis method. The effects of electric field, magnetic field, core radius, and shell thickness on the binding energy are analyzed in detail. The symmetrical distribution of binding energy is destroyed by electric field and the binding energy increases as magnetic field increases. Moreover, the results show that the effects of electric field and magnetic field are more obvious for an impurity located at the side and center of core-shell quantum dot, respectively. The donor impurity binding energy decreases with the increase of core radius. The donor impurity binding energy increases with the increase of barrier width, but when the barrier width reaches to a larger value, the binding energy no longer increases.