LO-phonon confinement and polaron effect in a quantum well.

Abstract

Polaronic corrections are calculated considering electron coupling with confined LO phonons in a quantum well (QW). The electron--LO-phonon Hamiltonian for a confined electron-phonon system in a QW is taken from a previous work. The electron self-energy is calculated by use of the standard perturbation-theory treatment for the weak-coupling polaron assuming parabolic energy band structure and T=0 K. Screening effects are included along the lines of the static Thomas-Fermi approximation. Comparison with different experimental works is made and acceptable agreement is achieved. We also present comparisons with other theoretical works on the subject.