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• W2334455786 abstract "We study phononic heat transport in nanoscale devices. In the nonequilibrium Green's function formalism, an analytical small-frequency expansion of the phonon current transmission is derived for an arbitrary oscillator chain with typical contact-device-contact structure. Applying this expansion in a Landauer formula, it is possible to construct a systematic low-temperature expansion of the thermal conductance. It follows that quantized thermal conductance occurs as a plateau of the thermal conductance divided by the temperature within second order of the temperature expansion for completely heterogeneous systems as long as the product of force constant and oscillator mass is identical in both contacts, independent of the scattering area. Beyond this plateau, the higher-order terms of the low-temperature expansion yield a finite-temperature correction exhibiting the form of a cubic power law depending on the details of the scattering area. These findings are in agreement with experiments and numerical calculations. Our general results are applied to a double junction chain, where we find as the first phenomenon beyond our low-temperature expansion a second plateau. This plateau is associated with a thermal phase averaging of the phonon transmission, which leads for increasing temperatures to an independence of the thermal conductance from the device length." @default.
• W2334455786 created "2016-06-24" @default.
• W2334455786 creator A5012247514 @default.
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• W2334455786 date "2014-04-28" @default.
• W2334455786 modified "2023-10-01" @default.
• W2334455786 title "Quantized thermal conductance via phononic heat transport in nanoscale devices at low temperatures" @default.
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• W2334455786 doi "https://doi.org/10.1103/physrevb.89.134309" @default.
• W2334455786 hasPublicationYear "2014" @default.
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