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arXiv 0710.4096cond-mat.str-el
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用密度矩阵方法研究两点Holstein模型的动力学性质

A density matrix approach to the dynamical properties of a two-site Holstein model

Simone Paganelli, Sergio Ciuchi

摘要:

两点Holstein模型代表了巡游电荷与量子振子之间相互作用的第一个非平凡范例,这是不同领域中非常常见的话题。精确的结果可以通过分析和数值计算来实现,然而,为了突出量子效应的作用,将它们与近似的半经典技术进行比较是有用的。本文考虑了绝热极限,在绝热极限下振子比电子慢得多,引入了密度矩阵方法来研究电荷动力学,并将其精确结果与两种不同的近似:基于Born-Oppenheimer的振子静态近似(SA)和量子经典近似(QC)进行了比较。

英文摘要:

The two-site Holstein model represents a first non-trivial paradigm for the interaction between an itinerant charge with a quantum oscillator, a very common topic in different ambits. Exact results can be achieved both analytically and numerically, nevertheless it can be useful to compare them with approximate, semi-classical techniques in order to highlight the role of quantum effects. In this paper we consider the adiabatic limit in which the oscillator is very much slow than the electron. A density matrix approach is introduced for studying the charge dynamics and the exact results are compared with two different approximations: a Born-Oppenheimer-based Static Approximation for the oscillator (SA) and a Quantum-classical (QC) dynamics.

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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