Johnson-Nyquist noise in narrow wires

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 $D\mathrm{/}{L}^2$ and to decay at higher frequencies as ${\omega }^{-1\mathrm{/}2}$. This result is contrasted with the noise spectra in neutral and charged liquids.