Variational Approach for Phonon Renormalization Effects in Photoexcited Quantum Wires and Quantum Wells

Authors: Kaan GÜVEN, Bilal TANATAR

Abstract: We investigate the effects of screening on polaronic corrections to the effective band edge in photoexcited quasi-one-dimensional GaAs quantum wires and two-dimensional quantum wells. We develop a variational method to calculate the polaron energy of a two-component plasma (electrons and holes) coupled to LO-phonons. Screening effects are incorporated within a dynamical scheme. We find that the screening effects and finite well width considerably reduce the polaron energy as the plasma density increases. Many-body corrections beyond the random-phase approximation is also considered.