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Electron transport and current fluctuations in short coherent conductors

2005; American Physical Society; Volume: 72; Issue: 20 Linguagem: Inglês

10.1103/physrevb.72.205417

1550-235X

Dmitry S. Golubev, Artem V. Galaktionov, Andrei D. Zaikin,

Advancements in Semiconductor Devices and Circuit Design

Employing a real-time effective action formalism we analyze electron transport and current fluctuations in comparatively short coherent conductors in the presence of electron-electron interactions. We demonstrate that, while Coulomb interaction tends to suppress electron transport, it may strongly enhance shot noise in scatterers with highly transparent conducting channels. This effect of excess noise is governed by the Coulomb gap observed in the current-voltage characteristics of such scatterers. We also analyze the frequency dispersion of higher current cumulants. Our results illustrate a direct relation between electron-electron interaction effects and current fluctuations in disordered mesoscopic conductors.