Collective charge density wave motion through an ensemble of Aharonov-Bohm rings

TL;DR

This paper theoretically studies how collective charge density waves move through an ensemble of disordered Aharonov-Bohm rings, revealing flux-dependent modulation of threshold fields and magnetoresistance with specific periodicity.

Contribution

It introduces a model showing flux-induced modulation of charge density wave dynamics in disordered ring ensembles, aligning with experimental observations.

Findings

Magnetic flux modulates threshold field and magnetoresistance.

Magnetoresistance oscillations decrease with increasing bias.

Oscillation periodicity is half the flux quantum, /2=h/2e.

Abstract

We investigate theoretically the collective charge density wave motion through an ensemble of small disordered Aharonov-Bohm rings. It is shown that the magnetic flux modulates the threshold field and the magnetoresistance with a half flux quantum periodicity $\Phi_{0}/2=h/2e$, resulting from ensemble averaging over random scattering phases of multiple rings. The magnitude of the magnetoresistance oscillations decreases rapidly with increasing bias. This is consistent with recent experiments on $NbSe_3$ in presence of columnar defects [Phys. Rev. Lett. 78, 919 (1997)].