1/f Noise in a one-dimensional charge density wave system

TL;DR

This study numerically investigates current noise in a one-dimensional charge density wave system, revealing flicker noise characterized by a 1/f power spectrum near the depinning threshold, aligning with experimental observations.

Contribution

First-principles numerical demonstration of 1/f noise in a 1D charge density wave system near depinning threshold.

Findings

Power spectrum scales as $S(f) \\sim f^{-1}$.

Results agree with experimental data.

Provides theoretical evidence for flicker noise in such systems.

Abstract

The current noise in a classical one-dimensional charge density wave system is studied in the weak pinning regime by solving the overdamped equation of motion numerically. At low temperatures and just above the zero temperature depinning threshold, the power spectrum of the current noise $S(f)$ was found to scale with frequency $f$ as $S(f) \sim f^{-\gamma}$, where $\gamma \approx 1$, suggesting the existence of {\it flicker noise}. Our result is in agreement with experimental findings for quasi-one-dimensional charge density wave systems and provides the first evidence of $1/f$ behavior obtained from first principles.