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arXiv 1412.6232cond-mat.stat-mech
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声子Cayley树网络中的热输运

Thermal Transport in Phononic Cayley Tree Networks

Huanan Li, Tsampikos Kottos, Boris Shapiro

摘要:

本文研究了无回路分支网络(凯莱树)中的热流$I$及其热涨落$Δ$。该网络由两种类型的谐波质量:顶点质量$M$放置在声子散射发生的分支点和质量$m$在声子传播发生的分支点之间的键。该网络耦合到由耦合质量$m$的一维谐波链组成的热库。由于阻抗不匹配现象,${\cal I}$和$Δ$都是质量比$μ=M/m$的非单调函数。特别地,存在它们在某个临界值$μ^*$以下严格为零的情况。

英文摘要:

We analytically investigate the heat current $I$ and its thermal fluctuations $Δ$ in a branching network without loops (Cayley tree). The network consists of two type of harmonic masses: vertex masses $M$ placed at the branching points where phononic scattering occurs and masses $m$ at the bonds between branching points where phonon propagation take place. The network is coupled to thermal reservoirs consisting of one-dimensional harmonic chains of coupled masses $m$. Due to impedance missmatching phenomena, both ${\cal I}$ and $Δ$, are non-monotonic functions of the mass ratio $μ=M/m$. In particular, there are cases where they are strictly zero below some critical value $μ^*$.

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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