Coulomb induced positive current-current correlations in normal conductors

Details Coulomb induced positive current-current correlations in normal conductors Coulomb induced positive current-current correlations in normal conductors

1999-11-17

arxiv.org/abs/cond-mat/9911254v2

Phys. Rev. Lett. 84, 3386 (2000).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex, 4 pages includes 2 figures

Scientific paper

10.1103/PhysRevLett.84.3386

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.

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