Measurement of the quantum of thermal conductance

Schwab, Keith; Henriksen, Erik; Worlock, J. M.; Roukes, M. L.

doi:10.1038/35010065

Cited by 885 publications

(778 citation statements)

References 26 publications

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“…A suitable estimation of thermal conductivity for ideal coupling between a ballistic thermal conductor and the reservoirs relies on the quantum of thermal conductance g 0 = 2 k B 2 T / ͑3h͒ = 9.46 ϫ 10 −13 T W K −1 , which represents the maximum possible value of energy transported per phonon mode. 57 In the regime of low temperatures four main modes, arising from dilatational, torsional, and flexural degrees of freedom, are expected for a quantum wire. 58 Therefore, the thermal conductivity of a DNA oligomer of length L N = 0.34N nm will be given by N Ӎ 4g 0 L N / ͑ R 2 ͒ = 0.02 W m −1 K −1 ͑at T =10 K͒ and N Ӎ 0.6 W m −1 K −1 ͑at room temperature͒ in optimal conditions.…”

Section: Discussionmentioning

confidence: 99%

DNA-based thermoelectric devices: A theoretical prospective

Maciá

2007

Phys. Rev. B

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The thermoelectric performance of PolyG-PolyC and PolyA-PolyT double-stranded chains connected between organic contacts at different temperatures is theoretically studied on the basis of an effective model Hamiltonian. The obtained analytical expressions reveal the existence of important resonance effects leading to a significant enhancement of the Seebeck coefficient depending on the Fermi level position. High thermoelectric power factors, up to P = ͑1.5-3͒ ϫ 10 −3 W m −1 K −2 , are obtained close to the resonance energy. These values suggest that significantly high values of the thermoelectric figure of merit may be attained for synthetic DNA samples at room temperature. The possibility of combining p-type and n-type synthetic DNA chains in the design of a nanoscale Peltier cell is discussed, taking into account both contact and environmental effects.

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Section: Discussionmentioning

confidence: 99%

DNA-based thermoelectric devices: A theoretical prospective

Maciá

2007

Phys. Rev. B

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“…1 Similarly, metallic nanowires can have unusual physical properties, such as quantized electron, photon, and phonon transport. [2][3][4][5][6] Enhanced strength, plasticity, and hardness were also observed for nanocrystalline metals as a result of limited dislocation mobility 1,[7][8][9][10][11] . While other deformation mechanisms, such as desclination activity 12 may participate at high deformation rates, diffusion-controlled grain boundary sliding [13][14][15] is likely to be the dominant deformation mechanism for nanosized grain materials.…”

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confidence: 98%

Co-continuous Metal−Ceramic Nanocomposites

2005

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A room temperature technique was developed to produce continuous metal nanowires embedded in random nanoporous ceramic skeletons. The synthesis involves preparation of uniform, nanoporous ceramic preforms, and subsequent electrochemical metal infiltration at room temperature, so to avoid materials incompatibilities frequently encountered in traditional high temperature liquid metal infiltration. Structure and preliminary evaluations of mechanical and electronic properties of copper/alumina nanocomposites are reported.Keywords: Metal/ceramic nanocomposite, Cu, porous Al 2 O 3 , electrochemical infiltration. * Corresponding author. Email: xfzhang@lbl.gov 2 Nanograin ceramics have been reported to exhibit dramatically increased strength, hardness, and superplasticity. 1 Similarly, metallic nanowires can have unusual physical properties, such as quantized electron, photon, and phonon transport. [2][3][4][5][6] Enhanced strength, plasticity, and hardness were also observed for nanocrystalline metals as a result of limited dislocation mobility 1,[7][8][9][10][11] . While other deformation mechanisms, such as desclination activity 12 may participate at high deformation rates, diffusion-controlled grain boundary sliding 13-15 is likely to be the dominant deformation mechanism for nanosized grain materials. It was also reported that scale effects are significant factors in determining strength and plasticity of metals, alloys, and superalloys for sizes up to as much as several micrometers. 16 When co-continuous metal/ceramic composites are created in which both the metallic and the ceramic components are of nanoscale size, the nature of the high interface/volume ratio and synergy of the combined physical properties may lead to a novel class of structural or functional materials.To avoid materials incompatibilities associated with the elevated temperatures required for molten metal infiltration, room temperature electrochemical infiltration of porous ceramic preforms has been considered. [17][18] Most published results have been for metal electrochemical infiltration of either submicron porous matrices 18 or micrometer thin anodized Al 2 O 3 membranes with one-dimensional nanopore channels . 6,17,[19][20] The present paper describes a method in which a nanograin ceramic compact is first produced with homogeneous nanoporosity, and subsequently filled with a continuous metallic nanowire network by room temperature electrochemical infiltration.Nanoporous alumina matrices (10 mm diameter and 1 mm thick, 40% porosity) were made by compacting and free sintering 20 nm γ-Al 2 O 3 nanopowder. The samples were placed in a holder, and electrochemical infiltration of Cu into the interconnected nanopore channels was done in a 0.2M CuSO 4 + 2M H 2 SO 4 + deionized water electroplating bath, with a Cu anode and the sample/Cu cathode 1.5 cm apart. Optimization of combined d.c. and a.c. currents was essential for efficient infiltration. The infiltrated samples were dried, and post-annealed at 500 o C in a He/4% H 2 atmosphere. The...

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“…In 2000, the phononic quantized thermal conductance counterpart was measured for the first time [29]. For the 1D quantum channel of thermal conductance, it is supposed that there are two thermal reservoirs characterized by the temperatures T L , T R and chemical potentials u L , u R , where subscripts L and R denote the left and right thermal reservoirs respectively.…”

Section: Hawking Radiation From Landauer Transport Modelmentioning

confidence: 99%

Non-equilibrium Landauer transport model for Hawking radiation from a Reissner—Nordstrom black hole

Zeng

Zhou²,

Liu

2012

Chinese Phys. B

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The recent work of Nation et al in which Hawking radiation energy and entropy flow from a black hole can be regarded as a one-dimensional (1D) Landauer transport process is extended to the case of a Reissner-Nordstrom (RN) black hole. It is found that the flow of charge current can also be transported via a 1D quantum channel except the current of Hawking radiation. The maximum entropy current, which is shown to be particle statistics independence, is also obtained.

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Measurement of the quantum of thermal conductance

Cited by 885 publications

References 26 publications

DNA-based thermoelectric devices: A theoretical prospective

DNA-based thermoelectric devices: A theoretical prospective

Co-continuous Metal−Ceramic Nanocomposites

Non-equilibrium Landauer transport model for Hawking radiation from a Reissner—Nordstrom black hole

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