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arXiv 0909.1441cond-mat.mes-hallcond-mat.str-elquant-ph
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多体背景下的退相速率公式

The dephasing rate formula in the many body context

Doron Cohen, Jan von Delft, Florian Marquardt, Yoseph Imry

摘要:

我们提出了一个简单的方法来计算在费米子系统中的退相速率,正确地跟踪泡利阻塞的关键物理。从费米的黄金法则出发,退相速率可以写为系统和环境之间传递的频率的积分,由它们各自的谱密度加权。我们表明,治疗完整的多费米子系统,而不是一个单一的粒子自动执行泡利原理。此外,我们解释的关系,化学。最后,我们展示了如何处理更涉及强耦合的情况下,相互作用明显修改的光谱。这与无序金属的情况有关,其中筛选是重要的。

英文摘要:

We suggest a straightforward approach to the calculation of the dephasing rate in a fermionic system, which correctly keeps track of the crucial physics of Pauli blocking. Starting from Fermi's golden rule, the dephasing rate can be written as an integral over the frequency transferred between system and environment, weighted by their respective spectral densities. We show that treating the full many-fermion system instead of a single particle automatically enforces the Pauli principle. Furthermore, we explain the relation to diagrammatics. Finally, we show how to treat the more involved strong-coupling case when interactions appreciably modify the spectra. This is relevant for the situation in disordered metals, where screening is important.

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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