Elementary events of electron transfer in a voltage-driven quantum point contact

Details Elementary events of electron transfer in a voltage-driven quantum point contact Elementary events of electron transfer in a voltage-driven quantum point contact

2007-01-12

arxiv.org/abs/cond-mat/0701282v2

Phys. Rev. Lett. 99, 076601 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures; to appear in PRL. Version 1 contains additional results for noise and the third cumulant at finite tempera

Scientific paper

10.1103/PhysRevLett.99.076601

We show 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.

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