Elementary events of electron transfer in a voltage-driven quantum point contact.
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.
Vanević
Mihajlo
M
Departement für Physik und Astronomie, Klingelbergstrasse 82, 4056 Basel, Switzerland.
Nazarov
Yuli V
YV
Belzig
Wolfgang
W