  Using diagrammatic methods we derive an effective interaction between a low
energy collective movement of fermionic liquid (acoustic plasmon) and acoustic
phonon. We show that the coupling between the plasmon and the lattice has a
very non-trivial, resonant structure. When real and imaginary parts of the
acoustic plasmon's velocity are of the same order as the phonon's velocity, the
resonance qualitatively changes the nature of phonon-drag. In the following we
study how magneto-thermoelectric properties are affected. Our result suggests
that the novel mechanism of energy transfer between electron liquid and crystal
lattice can be behind the huge Nernst effect in bismuth.
