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arXiv 0809.0075cond-mat.str-el
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相关密度矩阵:精确对角化的无偏分析

Correlation density matrix: an unbiased analysis of exact diagonalizations

Siew-Ann Cheong, C. L. Henley

摘要:

给定相互作用晶格模型的基态波函数,我们定义了两个不相交的、分离的团簇$A$和$B$的“相关密度矩阵“(CDM),即它们的并集的密度矩阵减去它们各自的密度矩阵的直积。CDM可以通过数值奇异值分解系统地分解,以提供系统和无偏的方式来识别主导相关性的算子,甚至是意外的算子。

英文摘要:

Given the ground state wavefunction for an interacting lattice model, we define a "correlation density matrix"(CDM) for two disjoint, separated clusters $A$ and $B$, to be the density matrix of their union, minus the direct product of their respective density matrices. The CDM can be decomposed systematically by a numerical singular value decomposition, to provide a systematic and unbiased way to identify the operator(s) dominating the correlations, even unexpected ones.

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