Current Noise Spectrum of a Quantum Shuttle

Christian Flindt, T. Novotny, Antti-Pekka Jauho

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    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. All rights reserved.
    Original languageEnglish
    JournalPhysica E: Low-Dimensional Systems and Nanostructures
    Volume29
    Issue number1-2
    Pages (from-to)411-418
    ISSN1386-9477
    DOIs
    Publication statusPublished - 2005

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