Tunneling Theory of Charge-Density-Wave Depinning

Introduction of a correlation length into the tunneling theory of depinning of charge-density waves by an electric field leads to a threshold field and to an expression for non-Ohmic conductivity in excellent agreement with experiments on the linear-chain compounds Nb${\mathrm{Se}}_{3}$ and Ta${\mathrm{S}}_{3}$. An extension of the theory leads to results for the frequency dependence of the ac conductivity, also in agreement with experiment.

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