Electron transport and current fluctuations in short coherent conductors

Abstract

Employing a real time effective action formalism we analyze electron\ntransport and current fluctuations in comparatively short coherent conductors\nin the presence of electron-electron interactions. We demonstrate that, while\nCoulomb interaction tends to suppress electron transport, it may {\\it strongly\nenhance} shot noise in scatterers with highly transparent conducting channels.\nThis effect of excess noise is governed by the Coulomb gap observed in the\ncurrent-voltage characteristics of such scatterers. We also analyze the\nfrequency dispersion of higher current cumulants and emphasize a direct\nrelation between electron-electron interaction effects and current fluctuations\nin disordered mesoscopic conductors.\n