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Power spectrum of electronic heat current fluctuations

Authors

  • Fei Zhan,

    1. Institut für Physik, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany
    2. Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, St. Lucia, Australia
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  • Sergey Denisov,

    1. Institut für Physik, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany
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  • Peter Hänggi

    Corresponding author
    1. Institut für Physik, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany
    2. Department of Physics and Centre for Computational Science and Engineering, National University of Singapore, Singapore, Singapore
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Abstract

We analyze the fluctuations of an electronic thermal current across an idealized molecular junction. The focus here will be on the spectral features of the resulting heat fluctuations. By use of the Green function method we derive an explicit expression for the frequency-dependent power spectral density of the emerging energy fluctuations. The complex expression simplifies considerably in the limit of zero frequency, yielding the noise intensity of the heat current. The spectral density for the electronic heat fluctuations still depends on the frequency in the zero-temperature limit, assuming different asymptotic behaviors in the low- and high-frequency regions. We further address subtleties and open problems from an experimental view point for measurements of frequency-dependent power spectral densities.

pssb201349192-gra-0001

Sketch of a molecular junction setup used in the text. The average heat flow is generated by electrons moving from a hot electrode inline image across the molecular junction towards a neighboring cold electrode inline image. The inter-electrode electronic level inline image can be tuned continuously.

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