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arXiv 2009.07747cond-mat.str-elcond-mat.mtrl-sci
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纠缠谱作为相互作用无自旋费米子模型密度嵌入理论中相变的标志

Entanglement spectrum as a marker for phase transitions in the density embedding theory for interacting spinless fermionic models

Xavier Plat, Chisa Hotta

摘要:

纠缠相关的性质作为量子多体波函数的良好指纹。然而,那些费米子模型是很难评估的标准数值方法,因为他们遭受有限尺寸效应。我们发现,一个所谓的密度嵌入理论(DET)可以评估他们没有尺寸标度分析在高质量的大尺寸密度矩阵重整化群分析。该方法将大规模的多体哈密顿量投影到定义在局部簇上的少量基组上,并通过调整局部密度矩阵来优化基组的选择.一维相互作用费米子的DET纠缠谱完美地再现了精确的纠缠谱,并作为相变点的标记。进一步指出,二维系统的相变可以由纠缠熵和反映波函数结构变化的保真度决定。

英文摘要:

Entanglement related properties work as nice fingerprint of the quantum many-body wave function. However, those of fermionic models are hard to evaluate in standard numerical methods because they suffer from finite size effects. We show that a so-called density embedding theory (DET) can evaluate them without size scaling analysis in comparably high quality with those obtained by the large-size density matrix renormalization group analysis. This method projects the large scale original many-body Hamiltonian to the small number of basis sets defined on a local cluster, and optimizes the choice of these bases by tuning the local density matrix. The DET entanglement spectrum of one-dimensional interacting fermions perfectly reproduces the exact ones and works as a marker of the phase transition point. It is further shown that the phase transitions in two-dimension could be determined by the entanglement entropy and the fidelity that reflects the change of the structure of the wave function.

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