Current noise in ac-driven nanoscale conductors

The theory for current fluctuations in ac-driven transport through nanoscale systems is put forward. By use of a generalized, non-Hermitian Floquet theory we derive novel explicit expressions for the time-averaged current and the zero-frequency component of the power spectrum of current fluctuations...

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Bibliographic Details
Published in:Physical review letters 2003-05, Vol.90 (21), p.210602-210602, Article 210602
Main Authors: Camalet, Sébastien, Lehmann, Jörg, Kohler, Sigmund, Hänggi, Peter
Format: Article
Language:English
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Summary:The theory for current fluctuations in ac-driven transport through nanoscale systems is put forward. By use of a generalized, non-Hermitian Floquet theory we derive novel explicit expressions for the time-averaged current and the zero-frequency component of the power spectrum of current fluctuations. A distinct suppression of both the zero-frequency noise and the dc current occurs for suitably tailored ac fields. The relative level of transport noise, being characterized by a Fano factor, can selectively be manipulated by ac sources; in particular, it exhibits both characteristic maxima and minima near current suppression.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.210602