Coulomb induced positive current-current correlations in normal conductors

Abstract

In the white-noise limit current correlations measured at different contacts of a mesoscopic conductor are negative due to the antisymmetry of the wave function (Pauli principle). We show that current fluctuations at capacitive contacts induced via the long range Coulomb interaction as consequence of charge fluctuations in the mesoscopic sample can be {\it positively} correlated. The positive correlations are a consequence of the extension of the wave-functions into areas near both contacts. As an example we investigate in detail a quantum point contact in a high magnetic field under conditions in which transport is along an edge state.

Revtex, 4 pages includes 2 figures

References in corpus (3)

• The Hanbury Brown and Twiss Experiment with Fermions
• Semi-classical Theory of Conductance and Noise in Open Chaotic Cavities
• Distribution functions and current-correlations in normal-metal--superconductor hetero-structures

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