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arXiv 2305.00536cond-mat.stat-mech
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长程耦合谐振链的非平衡稳态

Non-equilibrium steady states of long-range coupled harmonic chains

Francesco Andreucci, Stefano Lepri, Stefano Ruffo, Andrea Trombettoni

AI总结:

该研究数值模拟了长程耦合谐振链的输运性质,发现强长程区域中能量通量偏离微扰理论,呈现异常超扩散标度,并归因于透射谱的自相似分形结构。

摘要:

我们对一维链的输运性质进行了数值研究,该链的耦合随距离$r$按幂律$r^{-(1+σ)}$衰减,并采用开放边界条件,与两个热库相互作用。尽管模型简单,但在强长程区域($-1<σ<0$)展现出高度非平凡的特征。在与热库弱耦合时,能量通量偏离微扰理论的预测,并显示出热流随链尺寸的异常超扩散标度行为。我们将此行为追溯到链的透射谱,该谱具有自相似结构,并带有依赖于σ的特征分形维数。

英文摘要:

We perform a numerical study of transport properties of a one-dimensional chain with couplings decaying as an inverse power $r^{-(1+σ)}$ of the intersite distance $r$ and open boundary conditions, interacting with two heat reservoirs. Despite its simplicity, the model displays highly nontrivial features in the strong long-range regime, $-1<σ<0$. At weak coupling with the reservoirs, the energy flux departs from the predictions of perturbative theory and displays anomalous superdiffusive scaling of the heat current with the chain size. We trace back this behavior to the transmission spectrum of the chain, which displays a self-similar structure with a characteristic sigma-dependent fractal dimension.

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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