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Quantum Thermal Conductance of a One-Dimensional Wire

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It has been theoretically shown that in 1D the quantization of the thermal conductance is universal for thermal carriers that obey boson, fermion, or anyon statistics. Careful low temperature measurements on suspended dielectric wires by the Caltech group have demonstrated this universality for phonon (bosons). In this talk I will describe how calibrated thermal conductance measurements can be performed on electrons, where heat flows less than 10 fW have been measured. Comparing the electrical to the thermal conductance, a breakdown of the Wiedemann-Franz rule is found below the last quantised plateau.

This talk is part of the Semiconductor Physics series.

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