Abstract
We have measured the spatial correlations of low-frequency noise produced by charge-density-wave (CDW) motion in ${\mathrm{NbSe}}_{3}.$ The equal-time correlation function is approximately independent of spatial separation up to at least $500 \ensuremath{\mu}\mathrm{m},$ but can change abruptly at macroscopic crystal defects. The nonlocal response of the depinned CDW extends hundreds of $\ensuremath{\mu}\mathrm{m}$ from a locally applied ac drive and shows current-dependent structure mirroring that observed in the low-frequency noise. These results demonstrate a potentially powerful approach for characterizing CDW dynamics.
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