Shot noise control in ac-driven nanoscale conductors

Details Shot noise control in ac-driven nanoscale conductors Shot noise control in ac-driven nanoscale conductors

2004-02-06

arxiv.org/abs/cond-mat/0402182v2

Phys. Rev. B 70, 155326 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, 5 figures

Scientific paper

10.1103/PhysRevB.70.155326

We derive within a time-dependent scattering formalism expressions for both the current through ac-driven nanoscale conductors and its fluctuations. The results for the time-dependent current, its time average, and, above all, the driven shot noise properties assume an explicit and serviceable form by relating the propagator to a non-Hermitian Floquet theory. The driven noise cannot be expressed in terms of transmission probabilities. The results are valid for a driving of arbitrary strength and frequency. The connection with commonly known approximation schemes such as the Tien-Gordon approach or a high-frequency approximation is elucidated together with a discussion of the corresponding validity regimes. Within this formalism, we study the coherent suppression of current and noise caused by properly chosen electromagnetic fields.

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