title: Elementary events of electron transfer in a voltage-driven quantum point contact.
abstract: We find that the statistics of electron transfer in a coherent quantum point contact driven by an arbitrary time-dependent voltage is composed of elementary events of two kinds: unidirectional one-electron transfers determining the average current and bidirectional two-electron processes contributing to the noise only. This result pertains at vanishing temperature while the extended Keldysh-Green's function formalism in use also enables the systematic calculation of the higher-order current correlators at finite temperatures.
authors.affiliation: Departement für Physik und Astronomie, Klingelbergstrasse 82, 4056 Basel, Switzerland.
authors.forename: Mihajlo
authors.initials: M
authors.lastname: Vanević
authors.forename: Yuli V
authors.initials: YV
authors.lastname: Nazarov
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Belzig