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Theoretical constraints on reciprocal and non-reciprocal many-body radiative heat transfer

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arxiv 2007.13274 v1 pith:SDPAZCM6 submitted 2020-07-27 physics.optics cond-mat.mes-hall

classification physics.opticscond-mat.mes-hall
keywords heatconstraintsmany-bodytransfergroupmagneticnon-reciprocalradiative
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We study the constraints on reciprocal and non-reciprocal many-body radiative heat transfer imposed by symmetry and the second law of thermodynamics. We show that the symmetry of such a many-body system in general forms a magnetic group, and the constraints of the magnetic group on the heat transfer can be derived using a generalized reciprocity theorem. We also show that the second law of thermodynamics provides additional constraints in the form of a nodal conservation law of heat flow at equilibrium. As an application, we provide a systematic approach to determine the existence of persistent heat current in arbitrary many-body systems.

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