Johnson-Nyquist noise in narrow wires

TL;DR

This paper investigates the frequency-dependent Johnson-Nyquist noise in narrow semiconducting wires, revealing a white noise spectrum at low frequencies and a decay at higher frequencies, differing from liquids.

Contribution

It provides a theoretical analysis of noise spectra in narrow wires, highlighting the transition from white noise to a power-law decay at high frequencies.

Findings

Noise is white up to frequency D/L^2

Noise decays as ω^{-1/2} at higher frequencies

Contrasts with noise spectra in liquids

Abstract

The Johnson-Nyquist noise in narrow semiconducting wires having a transverse size smaller than the screening length is shown to be white up to frequency $D/L^2$ and to decay at higher frequencies as $\omega^{-{1/2}}$. This result is contrasted with the noise spectra in neutral and charged liquids.