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arXiv 2409.20009cond-mat.stat-mechcond-mat.str-elquant-ph
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提取相互作用费米子系统纠缠熵的高效量子蒙特卡洛算法

High-efficiency quantum Monte Carlo algorithm for extracting entanglement entropy in interacting fermion systems

Weilun Jiang, Gaopei Pan, Zhe Wang, Bin-Bin Mao, Heng Shen, Zheng Yan

AI总结:

针对费米子量子蒙特卡洛计算成本高的问题,提出沿物理参数增量的高效算法,并在 Hubbard 模型和 Gross-Neveu 临界点验证其精度与纠缠熵标度分析能力。

摘要:

通过量子蒙特卡洛利用纠缠熵数值探测新物相和相变,已在大规模相互作用自旋/玻色子系统中取得巨大成就。相比之下,尽管费米子系统在凝聚态物理中受到更多关注,对相互作用费米子系统的数值探索却很少。根本限制在于费米子量子蒙特卡洛的计算成本(约为 βN^3)远高于自旋/玻色子系统(约为 βN)。这里 N 是格点总数,β 是逆温度或投影长度。为解决这一问题,我们提出一种基于沿物理参数增量技术的费米子量子蒙特卡洛算法,显著提高了提取纠缠熵的效率。我们通过计算二维正方晶格 Hubbard 模型中纠缠熵的标度行为,对所开发算法进行基准测试。所得包含 Fermi 面和 Goldstone 模的相图验证了该算法的正确性。值得注意的是,与现有算法相比,我们的方法在保持高计算精度的同时展现出高效率。我们进一步应用该算法探索纠缠熵的标度行为,尤其是其在 Gross-Neveu 临界点处的导数。结果表明,这种临界行为可由关联长度指数定量刻画。

英文摘要:

The entanglement entropy probing novel phases and phase transitions numerically via quantum Monte Carlo has made great achievements in large-scale interacting spin/boson systems. In contrast, the numerical exploration in interacting fermion systems is rare, even though fermion systems attract more attentions in condensed matter. The fundamental restrictions is that the computational cost of fermion quantum Monte Carlo ($\sim βN^3$) is much higher than that of spin/boson ($\sim βN$). Here, $N$ is the total number of sites and $β$ is the inverse temperature or projection length. To tackle this problem, we propose a fermionic quantum Monte Carlo algorithm based on the incremental technique along physical parameters, which greatly improves the efficiency of extracting entanglement entropy. We benchmark the developed algorithm by calculating the scaling behavior of the entanglement entropy in a two-dimensional square lattice Hubbard model. The obtained phase diagram including Fermi surface and Goldstone modes validates the correctness of the algorithm. Remarkably, our method shows the high-efficiency with respect to the existing algorithms, while keeping the high computation precision. We proceed to apply this algorithm to explore the scaling behavior of the entanglement entropy and particularly its derivative at Gross-Neveu criticality. Our results elucidate that such critical behavior can be quantified by the correlation length exponent.

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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