Topological electronic phases, particularly nodal-ring structures, have emerged as a forefront theme in contemporary materials and physical sciences, yet their underlying physics remain elusive. Here, starting from the effective Hamiltonian, we employ fluctuation dissipation electrodynamics to show that the band-crossing topology intrinsic to nodal-ring eigenstates fundamentally reconstructs thermal radiation. These extended gapless electronic states critically modulate intraband excitation channels of thermal radiation, inducing a pronounced spectral blueshift and a suppression of radiative heat transfer. Furthermore, we further elucidate the temperature dependence of this topological radiative reconstruction, and we demonstrate that nodal-ring electronic states can constitute a versatile platform for radiative thermal management devices, including thermal switching, thermal rectification, and thermal stabilization.

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• Electronic structure
• Heat radiation
• Heat transfer
• Topological materials