Mechanisms of nonlinear conductivity and electrodynamics of quasi-one-dimensional conductors in the Peierls insulator state (review)

The nonlinear electromagnetic properties of quasi-one-dimensional conducting compounds in the Peierls phase are analyzed on the basis of the functional formalism developed in recent years. Such conductors can be divided into two major classes: conducting polymers with Peierls period doubling and quasi-one-dimensional metals with planar segments of the Fermi surface, which are characterized by the appearance of a charge density wave (CDW). A strong electric field has been shown to cause polarization of the Peierls state and tunneling generation of specific excitations, soliton–antisoliton pairs. We examine the contribution that collective excitations—solitons, large-radius polarons, and bipolarons—make to the conductivity. The distinctive features of optical and infrared absorption, parametric resonance, and anomalous magnetic properties are considered. Threshold effects in the conductivity of the Peierls state as a result of metallization and soliton dynamics are also discussed.

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