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Measurement of the Universal Quantum of Thermal Conductance – Keith Schwab

Date: Thu. May 11th, 2000, 12:30 pm-1:30 pm
Location: Rockefeller 221

We have performed experiments to probe directly the thermal conductance of suspended nanostructures with lateral dimensions ~100nm. It has been recently predicted that at low temperatures, thermal conductance in such a structure approaches a universal value of $\pi^2 k_B^2 \over
       3h$ for each massless, ballistic 1D channel, independent of material characteristics. We have developed ultra-sensitive, low dissipation dc-SQUID-based noise thermometry, and extreme isolation from the electronic environment in order to perform this measurement at temperatures <100mK. We will report our very recent successful measurements of this universal quantum of thermal conductance and the implications for single photon and possibly single phonon calorimetry.

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