Noise in Multiterminal Diffusive Conductors: Universality, Nonlocality and Exchange Effects

Details Noise in Multiterminal Diffusive Conductors: Universality, Nonlocality and Exchange Effects Noise in Multiterminal Diffusive Conductors: Universality, Nonlocality and Exchange Effects

1998-09-17

arxiv.org/abs/cond-mat/9809239v2

Phys. Rev. B59, 13054 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 double-column pages, REVTeX, 1 eps figure embedded with epsf; final version

Scientific paper

10.1103/PhysRevB.59.13054

We study noise and transport in multiterminal diffusive conductors. Using a Boltzmann-Langevin equation approach we reduce the calculation of shot-noise correlators to the solution of diffusion equations. Within this approach we prove the universality of shot-noise in multiterminal diffusive conductors of arbitrary shape and dimension for purely elastic scattering as well as for hot electrons. We show that shot-noise in multiterminal conductors is a non-local quantity and that exchange effects can occur in the absence of quantum phase coherence even at zero electron temperature. It is also shown that the exchange effect measured in one contact is always negative -- in agreement with the Pauli principle. We discuss a new phenomenon in which current noise is induced by thermal transport. We propose a possible experiment to measure locally the effective noise temperature. Concrete numbers for shot-noise are given that can be tested experimentally.

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