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- W4387611162 abstract "The thermal conductance quantum is a fundamental quantity in quantum transport theory. However, two decades after its first reported measurements and calculations for phonons in suspended nanostructures, reconciling experiments and theory remains elusive. Our massively parallel calculations of phonon transport in micrometer-sized three-dimensional structures suggest that part of the disagreement between theory and experiment stems from the inadequacy of macroscopic concepts to analyze the data. The computed local temperature distribution in the wave ballistic nonequilibrium regime shows that the spatial placement and dimensions of thermometers, heaters, and supporting microbeams in the suspended structures can noticeably affect the thermal conductance's measured values. In addition, diffusive transport assumptions made in the data analysis may result in measured values that considerably differ from the actual thermal conductance of the structure. These results urge for experimental validation of the suitability of diffusive transport assumptions in measuring devices operating at sub-kelvin temperatures." @default.
- W4387611162 created "2023-10-14" @default.
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- W4387611162 date "2023-10-13" @default.
- W4387611162 modified "2023-10-15" @default.
- W4387611162 title "The phonon quantum of thermal conductance: Are simulations and measurements estimating the same quantity?" @default.
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- W4387611162 doi "https://doi.org/10.1126/sciadv.adi7439" @default.
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