Mesoscopic Noise Theory: Microscopics, or Phenomenology?

Details Mesoscopic Noise Theory: Microscopics, or Phenomenology? Mesoscopic Noise Theory: Microscopics, or Phenomenology?

1999-05-07

arxiv.org/abs/cond-mat/9905086v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Invited paper, UPoN'99 Conference, Adelaide. 13 pp, no figs. Minor revisions to text and references

Scientific paper

10.1063/1.59993

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.

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