Stark effects on bound polarons in polar rectangular quantum wires

Abstract

The impurity binding energy in a polar rectangular quantum wire under an applied electric field is studied by a variational approach. The electron- and ion-longitudinal-optical (LO) phonon interactions are both taken into account in the calculations. The numerical results for the GaAs rectangular quantum wires show that the binding energies and Stark energy-shift are both sensitive to the size, shape of the wire section, and the position of the impurity. The binding energy increases with decreasing the section area. The LO phonon effect lowers the binding energy of the on-center impurity but raises that of the impurity near the wire surface, and gives a qualitatively similar contribution to the Stark effect.