Effects of electron– and impurity-ion–LO phonon couples on the impurity states in cylindrical quantum wires

Abstract

The variational method and the effective mass approximation are used to calculate the phonon effects on the hydrogenic impurity states in a cylindrical quantum wire with finite deep potential by taking both the couplings of the electron-confined bulk longitudinal optical (LO) phonons and the impurity-ion–LO phonons into account. The binding energies and the phonon contributions are calculated as functions of the transverse dimension of the quantum wire. The results show that the polaronic effect induced by the electron–LO phonon coupling and the screening effect induced by the impurity-ion–LO phonon coupling tend to compensate each other and the total effects reduce the impurity binding energies.

Effects of Polaron and Quantum Confinement on the Nonlinear Optical Properties in a GaAs/Ga1−xAlxAs Quantum Well Wire

“…As a result the total binding energy incorporating the contributions of electron interaction with the LO phonon also enhances. The results are in good agreement with other investigators [20,21]. It is found out from the insert figure that both the contributions of LO phonon with the polaron energy increase when the wire radius is decreased and this effect is more pronounced when the wire radius is decreased.…”