Nonequilibrium Green function simulation of coupled electron–phonon transport in one-dimensional nanostructures

Abstract

Phonon thermal-conductance of a one-dimensional semiconductor nanostructure has been calculated by self-consistently solving coupled nonequilibrium Green function equations for electrons and phonons. The channel length, N, dependence of the phonon thermal-conductance change, ΔKp, due to the electron–phonon interaction is found to obey a simple relation of with a constant proportionality factor β for the calculated N range up to N = 100 (Ge is the electrical conductance). The phonon thermal-conductance change in the isotopically disordered system is found to be hardly affected by the presence of the isotope impurities.