On thermal stability of Fröhlich polarons in bulk and nano-structured polar solids II: Diabatic ionization and depolarization

Abstract

In Paper I of this bipartite article, the two-particle vibrational DOS functions for spatially confined longitudinal acoustic and longitudinal optic phonons are implemented at evaluation on Fröhlich Polarons (FP) decay probability via the “Klemens channel” and lifetime for FP states confined within InAs quantum dots. Here, an alternative model based on the idea of diabatic thermally activated excitation of the FP charge carrier and consecutive lattice “depolarization” is used for evaluations on the spectral dependence of the phononic and polaronic lifetime(s). Key parameters of the “depolarization” phenomenon are evaluated quantitatively using the “entirely quantum” generalized “displaced harmonic oscillator” framework, which is closely related in spirit to the so-called “Feynman polaron” approximation.