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首页> 外文会议>Nanoscale thermoelectric materials: Thermal and electrical transport, and applications to solid-state cooling and power generation >Heat Transport between Heat Reservoirs Mediated by Quantum Systems
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Heat Transport between Heat Reservoirs Mediated by Quantum Systems

机译：量子系统介导的储热器之间的热传递

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摘要

We explore a model of heat transport between two heat reservoirs mediated by a quantum particle. The reservoirs are modeled as ensembles of harmonic modes linearly coupled to the mediator. The steady state heat current, as well as the thermal conductance are obtained for arbitrary coupling strength and will be analyzed for the cases of weak and strong coupling regimes. It is shown that the violation of the virial theorem - the imbalance between the average potential and kinetic energy of the mediator - can be considered as a measure of the coupling strength that takes into account all the relevant factors. The dependence of the thermal conductance on the coupling strength is non-monotonic and displays a maximum. Temperature dependence of the heat conductance may reach a plateau at intermediate temperatures, similar to the classical plateau at high temperatures. We will discuss the origin of Fourier's law in a chain of macroscopically large, but finite subsystems coupled by the quantum mediators. We will also address the origin of the anomalously large heat current between the scanning tunneling microscope tip and the substrate in deep vacuum which was found in recent experiments.
机译：我们探索了由量子粒子介导的两个热库之间的热传输模型。将储层建模为线性耦合到介体的谐波模式的集合。对于任意耦合强度，可以获得稳态热电流以及热导率，并将针对弱耦合和强耦合情况进行分析。结果表明，违反病毒定理-介体的平均势能和动能之间的不平衡-可以看作是考虑所有相关因素的耦合强度的量度。热导对耦合强度的依赖性是非单调的，并且显示最大值。热导率的温度依赖性在中间温度下可能达到平稳，类似于高温下的经典平稳。我们将在由量子介体耦合的一系列宏观的，有限的子系统中讨论傅立叶定律的起源。我们还将解决在最近的实验中发现的，在深真空中扫描隧道显微镜尖端和基底之间异常大的热流的起因。

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