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      Phonon transport and thermal conductivity in dielectric quantum wire

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      Journal of Physics D: Applied Physics
      IOP Publishing

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          Quantized conductance of point contacts in a two-dimensional electron gas

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            Is Open Access

            Thermal transport measurements of individual multiwalled nanotubes

            The thermal conductivity and thermoelectric power of a single carbon nanotube were measured using a microfabricated suspended device. The observed thermal conductivity is more than 3000 W/K m at room temperature, which is two orders of magnitude higher than the estimation from previous experiments that used macroscopic mat samples. The temperature dependence of the thermal conductivity of nanotubes exhibits a peak at 320 K due to the onset of Umklapp phonon scattering. The measured thermoelectric power shows linear temperature dependence with a value of 80 \(\mu\)V/K at room temperature.
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              Measurement of the quantum of thermal conductance

              The physics of mesoscopic electronic systems has been explored for more than 15 years. Mesoscopic phenomena in transport processes occur when the wavelength or the coherence length of the carriers becomes comparable to, or larger than, the sample dimensions. One striking result in this domain is the quantization of electrical conduction, observed in a quasi-one-dimensional constriction formed between reservoirs of two-dimensional electron gas. The conductance of this system is determined by the number of participating quantum states or 'channels' within the constriction; in the ideal case, each spin-degenerate channel contributes a quantized unit of 2e(2)/h to the electrical conductance. It has been speculated that similar behaviour should be observable for thermal transport in mesoscopic phonon systems. But experiments attempted in this regime have so far yielded inconclusive results. Here we report the observation of a quantized limiting value for the thermal conductance, Gth, in suspended insulating nanostructures at very low temperatures. The behaviour we observe is consistent with predictions for phonon transport in a ballistic, one-dimensional channel: at low temperatures, Gth approaches a maximum value of g0 = pi2kB2T/3h, the universal quantum of thermal conductance.
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                Author and article information

                Journal
                Journal of Physics D: Applied Physics
                J. Phys. D: Appl. Phys.
                IOP Publishing
                0022-3727
                1361-6463
                December 07 2003
                December 07 2003
                November 20 2003
                : 36
                : 23
                : 3027-3033
                Article
                10.1088/0022-3727/36/23/024
                a9488b4b-7625-4a98-b7f0-37fc1f6c7b60
                © 2003
                History

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