Journal article ยท Preprint article
Current Noise Spectrum of a Quantum Shuttle
We present a method for calculating the full current noise spectrum S(omega) for the class of nano-electromechanical systems (NEMS) that can be described by a Markovian generalized master equation. As a specific example we apply the method to a quantum shuttle. The noise spectrum of the shuttle has peaks at integer multiples of the mechanical frequency, which is slightly renormalized.
The renormalization explains a previously observed small deviation of the shuttle Current compared to the expected value given by the product of the natural mechanical frequency and the electron charge. For a certain parameter range the quantum shuttle exhibits a coexistence regime, where the charges are transported by two different mechanisms: Shuttling and sequential tunneling.
In our previous studies we showed that characteristic features in the zero-frequency noise could be quantitatively understood as a slow switching process between the two current channels, and the present study shows that this interpretation holds also qualitatively at finite frequency. (c) 2005 Elsevier B.V.
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Language: | English |
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Year: | 2005 |
Pages: | 411-418 |
ISSN: | 18731759 and 13869477 |
Types: | Journal article and Preprint article |
DOI: | 10.1016/j.physe.2005.05.040 |
ORCIDs: | Jauho, Antti-Pekka |