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Based on the Landauer formalism, we demonstrate that the thermal conductancedue to the propagation of surface phonon-polaritons along a polar nanowire isindependent of the material characteristics and is given by Pi^2kB^2T/3h. Thegiant propagation length of these energy carriers establishes that thisquantization holds not only for a temperature much smaller than 1 K, as is thecase of electrons and phonons, but also for temperatures comparable to roomtemperature, which can significantly facilitate its observation and applicationin the thermal management of nanoscale electronics and photonics.

Quantized Thermal Conductance of Nanowires at Room Temperature due to Surface Phonon-Polaritons