Response of Two-Dimensional Electron Gas to Pulses of a Phonon Field
Previously  it was shown that in perfect layered conducting systems (of the intercalated graphite type), at low temperatures, qualitatively new relaxation mechanisms exist which are significantly different from those in three-dimensional metals. The reason for this is that a system of interacting two-dimensional electrons and phonons (in general, three-dimensional one) breaks down in quasi-isolated groups. So, instead of one law of conservation of the total momentum of the electrons and phonons, there is an infinite number of approximate laws of conservation. As a result, the Bloch diffusion along Fermi surface caused by electrons colliding with phonons is blocked and far slower processes of superdiffusion come into action. The relaxation due to interelectron collisions in two dimensions also becomes much slower because the collisions are small angle in character. It is difficult to observe these effects in massive samples of layered metals because the mean free path of the electron due to collisions with lattice defects is insufficiently large.
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