Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 191, Issue 5-6, Pages 373-379Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-018-1854-y
Keywords
Electron-phonon coupling; Heat current; Quantum fluctuations
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Funding
- Academy of Finland [312057, 303677]
- European Union's Horizon research and innovation programme under the European Research Council (ERC) programme
- European Union's Horizon research and innovation programme under Marie Sklodowska-Curie actions [742559, 766025]
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We analyze heat current fluctuations between electrons and phonons in a metal. In equilibrium we recover the standard result consistent with the fluctuation-dissipation theorem. Here we show that heat current noise at finite frequencies remains non-vanishing down to zero temperature. From the experimental point of view, it is a small effect and up to now elusive. We briefly discuss the impact of electron-phonon heat current fluctuations on calorimetry, particularly in the regime of single microwave-photon detection.
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