Shot-noise control in ac-driven nanoscale conductors

Article

关键词: ELECTROSTATIC POTENTIAL PROFILE;    PHOTON-ASSISTED TRANSPORT;    TIME-DEPENDENT TRANSPORT;    DOUBLE-QUANTUM DOT;    MOLECULAR WIRES;    MESOSCOPIC CONDUCTORS;    FIELDS;    SCATTERING;    COHERENT;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.70.155326

来源: SCIE

【 摘 要 】

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 connections with commonly known approximation schemes such as the Tien-Gordon approach or a high-frequency approximation are 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.

【 授权许可】

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