Rényi entropies of interacting fermions from determinantal quantum Monte Carlo simulations

Rényi entropies of interacting fermions from determinantal quantum Monte Carlo simulations
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来自行列式量子蒙特卡罗模拟的相互作用费米子的 Rényi 熵

DOI:
10.1088/1742-5468/2014/08/p08015
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发表时间:
2014
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
--
通讯作者:
S. Trebst
S. Trebst
中科院分区:
--
文献类型:
--
作者:
P. Broecker;S. Trebst

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纠缠熵等纠缠测量方法已经成为识别相互作用量子多体系统基态基本性质的不可缺少的工具。对于相互作用的自旋或玻色自由度的系统,不仅在它们各自的纠缠熵的解析描述方面取得了很大的进展,而且在它们的数值分类方面也取得了很大的进展。然而,相互作用的费米子自由度系统已被证明更难控制,特别是在对其纠缠性质的数值理解方面。在这里,我们报告了用于计算Rényi熵的复制技术的推广到行列式量子蒙特卡罗模拟的框架--行列式量子蒙特卡罗模拟是对相互作用的费米子系统进行无偏的大规模模拟所选择的数值方法。我们通过研究零温和有限温度下一维Hubbard系统的纠缠熵,证明了该方法的优越性。
Entanglement measures such as the entanglement entropy have become an indispensable tool to identify the fundamental character of ground states of interacting quantum many-body systems. For systems of interacting spin or bosonic degrees of freedom much recent progress has been made not only in the analytical description of their respective entanglement entropies but also in their numerical classification. Systems of interacting fermionic degrees of freedom, however, have proved to be more difficult to control, in particular with regard to the numerical understanding of their entanglement properties. Here we report a generalization of the replica technique for the calculation of Rényi entropies to the framework of determinantal Quantum Monte Carlo simulations—the numerical method of choice for unbiased, large-scale simulations of interacting fermionic systems. We demonstrate the strength of this approach over a recent alternative proposal based on a decomposition in free fermion Green's functions by studying the entanglement entropy of one-dimensional Hubbard systems both at zero and finite temperatures.
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