Study of the energy variation in many-body open quantum systems: Role of interactions in the weak and strong coupling regimes

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  • Univ Turku, University of Turku, Dept Phys & Astron, Turku Ctr Quantum Phys, QTF Ctr Excellence


We derive an expression for the rate of change of the energy of an interacting many-body system connected to macroscopic leads. We show that the energy variation is the sum of contributions from each different lead. Unlike the charge current each of these contributions can differ from the rate of change of the energy of the lead. We demonstrate that the discrepancy between the two is due to the direct exchange of energy among the considered lead and all other leads. We conclude that the microscopic mechanism behind it is virtual processes via the interacting central region. We also speculate on what are the implications of our findings in the calculation of the thermal conductance of an interacting system.


Original languageEnglish
Article number045103
Pages (from-to)1-11
Number of pages11
JournalPhysical Review B
Issue number4
Publication statusPublished - 6 Jan 2020
MoE publication typeA1 Journal article-refereed

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ID: 40549945