The frictional drag force between separated but coupled two-dimensional electron gases of different temperatures is studied using the nonequilibrium Green's-function method based on the separation of the center of mass and the relative dynamics of electrons. As for the mechanisms that produce the frictional force we include the direct Coulomb interaction, the interaction mediated via virtual and real TA and LA phonons, optic phonons, plasmons, and TA and LA phonon-electron collective modes. We found that when the distance between the two-electron gases is large, and at intermediate temperature where plasmons and collective modes play the most important role in the frictional drag, the possibility of having a temperature difference between two subsystems greatly modifies the transresistivity.
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