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arXiv 2302.13874cond-mat.stat-mech
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热整流、热通量与光谱匹配

Heat rectification, heat fluxes, and spectral matching

Javier Navarro, Juan Gonzalo Muga, Marisa Pons

AI总结:

本文通过双耦合离子最小链模型解析研究热整流,提出光谱匹配定义并证明其与热通量比在最优整流条件下成正比,可推广至N粒子系统。

摘要:

热整流器将有助于冷却或能量收集等能源管理操作,但具有实际应用价值的器件仍然缺失。在基础层面理解热整流是帮助我们找到或设计此类器件的关键。器件各段声子能带谱在热浴正向或反向温度偏置下的匹配或不匹配,被认为是整流背后的机制。然而,迄今为止尚未从第一性原理出发找到热通量与光谱匹配之间的明确理论关系。我们研究了一个由两个耦合离子组成的最小链中的热整流。通量和整流可以解析计算。我们提出了一种匹配定义,该定义为热通量设定了一个上界。在器件实现最优整流的区域中,正向和反向构型的匹配比与通量比被发现成正比。这些结果可以推广到由N个粒子组成的系统,这些粒子处于任意势阱中并具有最近邻线性相互作用。

英文摘要:

Heat rectifiers would facilitate energy management operations such as cooling, or energy harvesting, but devices of practical interest are still missing. Understanding heat rectification at a fundamental level is key to help us find or design such devices. The match or mismatch of the phonon band spectrum of device segments for forward or reverse temperature bias of the thermal baths at device boundaries, was proposed as the mechanism behind rectification. However no explicit, theoretical relation derived from first principles had been found so far between heat fluxes and spectral matching. We study heat rectification in a minimalistic chain of two coupled ions. The fluxes and rectification can be calculated analytically. We propose a definition of the matching that sets an upper bound for the heat flux. In a regime where the device rectifies optimally, matching and flux ratios for forward and reverse configurations are found to be proportional. The results can be extended to a system of N particles in arbitrary traps with nearest-neighbor linear interactions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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