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arXiv 0904.3972cond-mat.dis-nncond-mat.mes-hall
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空间关联无序的相干势近似

Coherent potential approximation for spatially correlated disorder

Roland Zimmermann, Christoph Schindler

摘要:

推广相干势近似,使之能较好地描述粒子在空间关联的光滑随机势中的运动。与现有的集群CPA方法相比,本方案保留了传统CPA的简单性,使用一个单一的自能量函数。它的准确性检查的格林函数的精确时刻的比较,并与数值模拟的光谱功能。该方案适用于激子吸收光谱在不同的空间维度。

英文摘要:

The coherent potential approximation (CPA) is extended to describe satisfactorily the motion of particles in a random potential which is spatially correlated and smoothly varying. In contrast to existing cluster-CPA methods, the present scheme preserves the simplicity of the conventional CPA in using a single self-energy function. Its accuracy is checked by a comparison with the exact moments of the Green's function, and with the spectral function from numerical simulations. The scheme is applied to excitonic absorption spectra in different spatial dimensions.

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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