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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-ideal transmission coefficients and not by the quantized thermal conductance of the nanowire itself. This limitation of heat transport in the quantum regime may have a significant impact on modern thermal management and thermal circuit design.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tavakoli A,Lulla K,Crozes T,Mingo N,Collin E,Bourgeois O

doi

10.1038/s41467-018-06791-0

subject

Has Abstract

pub_date

2018-10-16 00:00:00

pages

4287

issue

1

issn

2041-1723

pii

10.1038/s41467-018-06791-0

journal_volume

9

pub_type

杂志文章

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