Non-linear conductivity of charge-density-wave systems

Details Non-linear conductivity of charge-density-wave systems Non-linear conductivity of charge-density-wave systems

1997-09-26

arxiv.org/abs/cond-mat/9709296v2

Ann. Physik 6 (1997) 595-610

Physics

Condensed Matter

Disordered Systems and Neural Networks

16 pages, 6 figures

Scientific paper

10.1002/andp.19975090803

We consider the problem of sliding motion of a charge-density-wave subject to static disorder within an elastic medium model. Starting with a field-theoretical formulation, which allows exact disorder averaging, we propose a self-consistent approximation scheme to obtain results beyond the standard large-velocity expansion. Explicit calculations are carried out in three spatial dimensions. For the conductivity, we find a strong-coupling regime at electrical fields just above the pinning threshold. Phase and velocity correlation functions scale differently from the high-field regime, and static phase correlations converge to the pinned-phase behaviour. The sliding charge-density-wave is accompanied by narrow-band noise.

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