Green's-function approach to nonlinear electronic transport for an electron-impurity-phonon system in a strong electric field.

摘要: A Green's-function approach to nonlinear electronic transport in a static electric field is developed microscopically for the system composed of interacting electrons with impurities and phonons. The essential idea separate center-of-mass motion from relative electrons. An electron temperature introduced as measurement internal energy without reference any distribution function. By allowing different temperatures decoupled phonons initial state, we obtain density matrix electron-lattice first order interaction but under arbitrarily strong field. frictional force experienced by center mass transfer rate phonon are derived means technique, force- energy-balance equations steady state obtained. These applied calculations ratio lattice resistivity functions drift velocity impurity, acoustic-phonon, optical-phonon scatterings. dynamic nature Coulomb screening charge carriers studied numerically. One interesting predictions possible cooling at low samples impurity concentration.