Photonic heat transport from weak to strong coupling

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-03-01
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Language
en
Pages
9
1-9
Series
Physical Review B, Volume 107, issue 10
Abstract
Superconducting circuits provide a favorable platform for quantum thermodynamic experiments. An important component for such experiments is a heat valve, i.e., a device which allows one to control the heat power flowing through the system. Here we theoretically study the heat valve based on a superconducting quantum interference device (SQUID) coupled to two heat baths via two resonators. The heat current in such a system can be tuned by magnetic flux. We investigate how the heat current modulation depends on the coupling strength g between the SQUID and the resonators. In the weak coupling regime the heat current modulation grows as g2, but, surprisingly, at the intermediate coupling it can be strongly suppressed. This effect is linked to the resonant nature of the heat transport at weak coupling, where the heat current dependence on the magnetic flux is a periodic set of narrow peaks. At the intermediate coupling the peaks become broader and overlap, thus reducing the heat modulation. At very strong coupling the heat modulation grows again and finally saturates at a constant value.
Description
Funding Information: We acknowledge the support by the Academy of Finland Centre of Excellence program (Project No. 312057). We would also like to acknowledge very helpful discussions with J. P. Pekola. Publisher Copyright: © 2023 American Physical Society.
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Citation
Tam , M , Thomas , G & Golubev , D S 2023 , ' Photonic heat transport from weak to strong coupling ' , Physical Review B , vol. 107 , no. 10 , 104518 , pp. 1-9 . https://doi.org/10.1103/PhysRevB.107.104518