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The interplay of spin angular momentum and thermal radiation is a frontierarea of interest to nanophotonics as well as topological physics. Here, we showthat a thick planar slab of a nonreciprocal material, despite being at thermalequilibrium with its environment, can exhibit nonzero photon spin angularmomentum and nonzero radiative heat flux in its vicinity. We identify them asthe persistent thermal photon spin (PTPS) and the persistent planar heatcurrent (PPHC) respectively. With a practical example system, we reveal thatthe fundamental origin of these phenomena is connected to spin-momentum lockingof thermally excited evanescent waves. We also discover spin magnetic moment ofsurface polaritons in nonreciprocal photonics that further clarifies thesefeatures. We then propose a novel thermal photonic imaging experiment based onBrownian motion that allows one to witness these surprising features bydirectly looking at them using a lab microscope. We further demonstrate theuniversal behavior of these near-field thermal radiation phenomena through acomprehensive analysis of gyroelectric, gyromagnetic and magneto-electricnonreciprocal materials. Together, these results expose a surprisingly littleexplored research area of thermal spin photonics with prospects for new avenuesrelated to non-Hermitian topological photonics and radiative heat transport.

Thermal spin photonics in the near-field of nonreciprocal media