Mixed electrical-heat noise spectrum in a quantum dot

Using the Keldysh Green function technique, we calculate the finite-frequency correlator between the electrical current and the heat current flowing through a quantum dot connected to reservoirs. At equilibrium, we find that this quantity, called mixed noise, is linked to the thermoelectric ac condu...

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Bibliographic Details
Published in:Physical review. B 2016-11, Vol.94 (20), Article 205416
Main Authors: Eyméoud, Paul, Crépieux, Adeline
Format: Article
Language:English
Subjects:
Alternating current
Coherence
Green's functions
Noise
Quantum dots
Reservoirs
Resistance
Temperature gradients
Variation
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Summary:Using the Keldysh Green function technique, we calculate the finite-frequency correlator between the electrical current and the heat current flowing through a quantum dot connected to reservoirs. At equilibrium, we find that this quantity, called mixed noise, is linked to the thermoelectric ac conductance by the fluctuation-dissipation theorem. Out of equilibrium, we discuss its spectrum and find evidence of the close relationship between the mixed noise and the thermopower. We study the spectral coherence and identify the conditions to have a strong correlation between the electrical and heat currents. The change in the spectral coherence due to the presence of a temperature gradient between the reservoirs is also highlighted.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.205416