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arXiv 1106.2145cond-mat.mes-hall
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具有自洽库的谐振子链中的量子传热:精确数值模拟

Quantum heat transfer in harmonic chains with self consistent reservoirs: Exact numerical simulations

Malay Bandyopadhyay, Dvira Segal

摘要:

我们描述了一个精确模拟具有自洽库的量子谐振链中热流行为的数值方案。数值精确的结果相比,经典的模拟和量子行为下的线性响应近似。在经典极限或小的温度偏差,我们的结果与以前的计算相吻合。在大偏压和低温下,系统的量子动力学从根本上不同于接近平衡的行为,特别揭示了不对称链的热整流效应。由于这种效应在我们模型的经典模拟中不存在,我们得出结论,在这里研究的量子模型中,热整流是一种纯粹的量子现象,植根于量子统计。

英文摘要:

We describe a numerical scheme for exactly simulating the heat current behavior in a quantum harmonic chain with self-consistent reservoirs. Numerically-exact results are compared to classical simulations and to the quantum behavior under the linear response approximation. In the classical limit or for small temperature biases our results coincide with previous calculations. At large bias and for low temperatures the quantum dynamics of the system fundamentally differs from the close-to-equilibrium behavior, revealing in particular the effect of thermal rectification for asymmetric chains. Since this effect is absent in the classical analog of our model, we conclude that in the quantum model studied here thermal rectification is a purely quantum phenomenon, rooted in the quantum statistics.

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