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

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PHYSICAL REVIEW LETTERS
卷 99, 期 7, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.99.076601

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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.

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