Convective Term and Transversely Driven Charge-Density Waves

TL;DR

This paper derives the convective damping terms affecting charge-density wave (CDW) motion and investigates the impact of transverse currents, finding the effect to be minimal and often mimicked by geometric factors.

Contribution

It provides a detailed derivation of convective damping terms and clarifies the negligible influence of transverse currents on CDW dynamics, contrasting recent predictions.

Findings

Transverse currents have a much smaller effect than previously predicted.

Contributions from electron- and hole-like quasiparticles act in opposite directions.

Geometry effects can mimic the influence of transverse currents.

Abstract

We derive the convective terms in the damping which determine the structure of the moving charge-density wave (CDW), and study the effect of a current flowing transverse to conducting chains on the CDW dynamics along the chains. In contrast to a recent prediction we find that the effect is orders of magnitude smaller, and that contributions from transverse currents of electron- and hole-like quasiparticles to the force exerted on the CDW along the chains act in the opposite directions. We discuss recent experimental verification of the effect and demonstrate experimentally that geometry effects might mimic the transverse current effect.