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arXiv 1003.1992cond-mat.stat-mech
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有限尺寸系统的Kubo公式

Kubo formula for finite size systems

Jinshan Wu, Mona Berciu

摘要:

我们证明,只有当明确考虑到引线/浴的耦合时,才能对有限尺寸系统的线性响应进行适当的计算。我们通过获得一个库波型公式耦合到两个热浴,保持在不同的温度下的有限大小的系统中的热传输来验证这一点。我们表明,适当的计算结果在一个良好的行为的响应,没有奇异的贡献时遇到的退化状态Kubo公式的无限大小的系统不适当地用于有限大小的系统。

英文摘要:

We demonstrate that the proper calculation of the linear response for finite-size systems can only be performed if the coupling to the leads/baths is explicitly taken into consideration. We exemplify this by obtaining a Kubo-type formula for heat transport in a finite-size system coupled to two thermal baths, kept at different temperatures. We show that the proper calculation results in a well-behaved response, without the singular contributions from degenerate states encountered when Kubo formulae for infinite-size systems are inappropriately used for finite-size systems.

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