Phonon-associated vertical electron hopping transport in superlattices with intentional disorder

The hopping transition rate governing the phonon-associated conductivity in superlattices with vertical disorder has been calculated, and the temperature dependence of an important hopping transport theory parameter, namely, the preexponential factor (i.e., the "frequency of hopping attempts") in the expression for the transition rate obtained. It has been demonstrated that the frequency of hopping attempts can strongly depend on temperature, the dependence varying from quadratic (at high temperatures within the classical phonon statistics domain) to linear at low temperatures.