Heat conduction measurements in ballistic 1D phonon waveguides indicate breakdown of the thermal conductance quantization.

ABSTRACT: Emerging quantum technologies require mastering thermal management, especially at the nanoscale. It is now accepted that thermal metamaterial-based phonon manipulation is possible, especially at sub-kelvin temperatures. In these extreme limits of low temperatures and dimensions, heat conduction enters a quantum regime where phonon exchange obeys the Landauer formalism. Phonon transport is then governed by the transmission coefficients between the ballistic conductor and the thermal reservoirs. Here we report on ultra-sensitive thermal experiments made on ballistic 1D phonon conductors using a micro-platform suspended sensor. Our thermal conductance measurements attain a power sensitivity of 15 attoWatts [Formula: see text] around 100 mK. Ballistic thermal transport is dominated by non-idea

SUBMITTER: Tavakoli A 

PROVIDER: S-EPMC6191430 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature