  Electron transport through a double quantum dot system is studied with taking
into account electron-phonon interaction. The Keldysh nonequilibrium Green
function formalism is used to compute the current and transmission coefficient
of the system. The influence of the electron-phonon interaction, interdot
tunneling, and temperature on the density of states and current is analyzed.
Results show that although the electron-phonon interaction results in the
appearance of side peaks in the conductance at low temperatures, they are
disappeared in high temperatures.
