Kapitza thermal resistance between a metal and a nonmetal

Mahan, G. D.

doi:10.1103/physrevb.79.075408

Cited by 84 publications

(73 citation statements)

References 30 publications

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“…This formalism is applicable to polar insulators where the electronic degrees of freedom are frozen. In the case of insulator-metal interfaces, one could extend the formalism to include the interaction with image charges in the metal to capture the coupling mechanism across the gap 34,35 . The short-range repulsive forces in sodium chloride arising due to the overlapping electron clouds of neighbouring ions are modelled here using the empirical nearest neighbour central potential developed by Kellerman 33,36 .…”

Section: Resultsmentioning

confidence: 99%

Transition from near-field thermal radiation to phonon heat conduction at sub-nanometre gaps

et al. 2015

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When the separation of two surfaces approaches sub-nanometre scale, the boundary between the two most fundamental heat transfer modes, heat conduction by phonons and radiation by photons, is blurred. Here we develop an atomistic framework based on microscopic Maxwell's equations and lattice dynamics to describe the convergence of these heat transfer modes and the transition from one to the other. For gaps 41 nm, the predicted conductance values are in excellent agreement with the continuum theory of fluctuating electrodynamics. However, for sub-nanometre gaps we find the conductance is enhanced up to four times compared with the continuum approach, while avoiding its prediction of divergent conductance at contact. Furthermore, low-frequency acoustic phonons tunnel through the vacuum gap by coupling to evanescent electric fields, providing additional channels for energy transfer and leading to the observed enhancement. When the two surfaces are in or near contact, acoustic phonons become dominant heat carriers.

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Section: Resultsmentioning

confidence: 99%

Transition from near-field thermal radiation to phonon heat conduction at sub-nanometre gaps

et al. 2015

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“…Sergeev [18] treated the EP coupling at interface in analogous to the inelastic electron-impurity scattering and found that the TBC is proportional to the inverse of EP energy relaxation time. Mahan [19] calculated the TBC by considering the EP coupling at interface due to image potential generated by ion charges. Ren and Zhu [20] found an asymmetric and negative differential TBC by considering nanoscale metal-nonmetal interfaces.…”

Section: Introductionmentioning

confidence: 99%

Thermal boundary conductance across metal-nonmetal interfaces: effects of electron-phonon coupling both in metal and at interface

Wang

Zhou

et al. 2015

Eur. Phys. J. B

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Abstract. We theoretically investigate the thermal boundary conductance across metal-nonmetal interfaces in the presence of the electron-phonon coupling not only in metal but also at interface. The thermal energy can be transferred from metal to nonmetal via three channels: (1) the phonon-phonon coupling at interface; (2) the electron-phonon coupling at interface; and (3) the electron-phonon coupling within metal and then subsequently the phonon-phonon coupling at interface. We find that these three channels can be described by an equivalent series-parallel thermal resistor network, based on which we derive out the analytic expression of the thermal a e-mail:zhoujunzhou@tongji.edu.cn b e-mail:jieustc@gmail.com 2 boundary conductance. We then exemplify different contributions from each channel to the thermal boundary conductance in three typical interfaces: Pb-diamond, Ti-diamond, and TiN-MgO. Our results reveal that the competition among above channels determines the thermal boundary conductance.3

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“…Hence, for metal-dielectric interfacial heat transport, energy transfer includes three possible pathways: (1) energy exchange between phonons in metal and phonons in dielectric, which is widely studied with the acoustic and diffuse mismatch models [3][4][5][6]; (2) nonequilibrium electron-phonon (e-ph) energy exchange within the metal, with subsequently phonon-phonon coupling across the interface [7][8][9]; (3) direct energy transfer from electrons in metal to phonons in dielectric through inelastic scattering induced by e-ph coupling across the interface [10][11][12].…”

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confidence: 99%

“…Therefore, understanding the interface heat transfer across nanoscale metal-dielectric hybrid structures is a long-standing challenge not only of fundamental interest, but also for practical applications in device design [6,34]. There are few previous efforts towards understanding the interfacial heat transfer in bulk metal-dielectric systems through the direct e-ph interaction [10][11][12]. In particular, the heat diode effect and NDTC have escaped from the attention, and many important questions are left open: Can the bulk metal-dielectric with interfacial e-ph coupling possess the heat diode and/or the NDTC properties?…”

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confidence: 99%

“…This expression is familiar from earlier discussions of energy transfer between electrons and phonons either within a single system [1,36] or between separate systems [10][11][12]. To further proceed, one usually considers a good metal, i.e., the integral over dε converges within a thermal energy k B T L around the Fermi level µ F so that the bulk electronic DOS can be taken as a constant…”

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confidence: 99%

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Heat diode effect and negative differential thermal conductance across nanoscale metal-dielectric interfaces

Ren

Zhu

2013

Phys. Rev. B

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Controlling heat flow by phononic nanodevices has received significant attention recently, because of its fundamental and practical implications. Elementary phononic devices such as thermal rectifiers, transistors and logic-gates are essentially based on two intriguing properties: heat diode effect and negative differential thermal conductance. However, little is known about these heat transfer properties across metal-dielectric interfaces, especially at nanoscale. Here we analytically resolve the microscopic mechanism of the nonequilibrium nanoscale energy transfer across metal-dielectric interfaces, where the inelastic electron-phonon scattering directly assists the energy exchange. We demonstrate the emergence of heat diode effect and negative differential thermal conductance in nanoscale interfaces and explain why these novel thermal properties are usually absent in bulk metal-dielectric interfaces. These results will generate exciting prospects for the nanoscale interfacial energy transfer, which should have important implications in designing hybrid circuits for efficient thermal control and open up potential applications in thermal energy harvesting with low-dimensional nanodevices.

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Kapitza thermal resistance between a metal and a nonmetal

Cited by 84 publications

References 30 publications

Transition from near-field thermal radiation to phonon heat conduction at sub-nanometre gaps

Transition from near-field thermal radiation to phonon heat conduction at sub-nanometre gaps

Thermal boundary conductance across metal-nonmetal interfaces: effects of electron-phonon coupling both in metal and at interface

Heat diode effect and negative differential thermal conductance across nanoscale metal-dielectric interfaces

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