Sound propagation in density wave conductors and the effect of long-range Coulomb interaction

Details Sound propagation in density wave conductors and the effect of long-range Coulomb interaction Sound propagation in density wave conductors and the effect of long-range Coulomb interaction

1995-08-06

arxiv.org/abs/cond-mat/9508019v1

Physics

Condensed Matter

revtex, 14 pages (in preprint form), submitted to PRB

Scientific paper

10.1103/PhysRevB.53.3741

We study theoretically the sound propagation in charge- and spin-density waves in the hydrodynamic regime. First, making use of the method of comoving frame, we construct the stress tensor appropriate for quasi-one dimensional systems within tight-binding approximation. Taking into account the screening effect of the long-range Coulomb interaction, we find that the increase of the sound velocity below the critical temperature is about two orders of magnitude less for longitudinal sound than for transverse one. It is shown that only the transverse sound wave with displacement vector parallel to the chain direction couples to the phason of the density wave, therefore we expect significant electromechanical effect only in this case.

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