Observation of Topological Edge States in Thermal Diffusion.Topological band theory predicts that bulk materials with nontrivial topological phases support topological edge states.  By direct probe of the temperature diffusion, the Hamiltonian of a thermal lattice is experimentally retrieved, and the emergence of topological edge decays is observed within the gap of bulk decays.  This work constitutes a thermal analogue of topological insulators and paves the way to exploring defect-immune heat dissipation.
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