Johnson-Nyquist noise in films and narrow wires

Details Johnson-Nyquist noise in films and narrow wires Johnson-Nyquist noise in films and narrow wires

2000-02-10

arxiv.org/abs/cond-mat/0002153v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.62.4656

The Johnson-Nyquist noise in narrow wires having a transverse size smaller than the screening length is shown to be white up to the frequency $D/L^2$ and to decay at higher frequencies as $\omega^{-{1/2}}$. In two-dimensional films having a thickness smaller than the screening length, the Johnson-Nyquist noise is predicted to be frequency independent up to the frequency $\sigma_{2D}/L$ and to have a {\it universal} $1/\omega$ spectrum at higher frequencies. These results are contrasted with the conventional noise spectra in neutral and three-dimensional charged liquids.

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