Mesoscopic Noise Theory: Microscopics, or Phenomenology?
arXiv:cond-mat/9905086 · doi:10.1063/1.59993
Abstract
We argue, physically and formally, that existing diffusive models of noise yield inaccurate microscopic descriptions of nonequilibrium current fluctuations. The theoretical shortfall becomes pronounced in quantum-confined metallic systems, such as the two-dimensional electron gas. In such systems we propose a simple experimental test of mesoscopic validity for diffusive theory's central claim: the smooth crossover between Johnson-Nyquist and shot noise.
Invited paper, UPoN'99 Conference, Adelaide. 13 pp, no figs. Minor revisions to text and references