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arXiv 2407.04205quant-phcond-mat.str-el
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用于模拟Kitaev自旋液体动力学响应函数的量子子空间展开方法

Quantum subspace expansion approach for simulating dynamical response functions of Kitaev spin liquids

University of Exeter(埃克塞特大学);National Physical Laboratory(英国国家物理实验室);Royal Holloway, University of London(伦敦大学皇家霍洛威学院)

Chukwudubem Umeano, François Jamet, Lachlan P. Lindoy, Ivan Rungger, Oleksandr Kyriienko

AI总结:

本文提出基于量子子空间展开的量子模拟方法,结合对称引导拟设等技术模拟有限磁场下Kitaev自旋液体的动力学响应相关性质,验证了量子模拟器在强关联磁体研究中的应用价值。

摘要:

我们开发了一种基于量子模拟的方法,用于研究规模不断增大的强关联磁性材料的性质。我们以蜂窝状Kitaev模型所承载的量子自旋液体(QSL)态这一典型范例为研究对象,采用可训练的对称引导拟设来制备其基态。我们运用量子子空间展开(QSE)、哈密顿算符近似和重叠测量工具,模拟了零温及有限磁场下的量子自旋液体,从而将研究范围拓展至对称子空间之外。接下来,我们实现了一种基于量子子空间展开的自旋-自旋关联函数测量协议。最后,我们对有限磁场Kitaev模型格林函数得到的动力学结构因子开展了基于量子子空间展开的模拟。我们的结果表明,量子模拟器能够为强关联磁体的准粒子性质提供研究视角,可成为材料科学研究的重要工具。

英文摘要:

We develop a quantum simulation-based approach for studying properties of strongly correlated magnetic materials at increasing scale. We consider a paradigmatic example of a quantum spin liquid (QSL) state hosted by the honeycomb Kitaev model, and use a trainable symmetry-guided ansatz for preparing its ground state. Applying the tools of quantum subspace expansion (QSE), Hamiltonian operator approximation, and overlap measurements, we simulate the QSL at zero temperature and finite magnetic field, thus moving outside of the symmetric subspace. Next, we implement a protocol for quantum subspace expansion-based measurement of spin-spin correlation functions. Finally, we perform QSE-based simulation of the dynamical structure factor obtained from Green's functions of the finite field Kitaev model. Our results show that quantum simulators offer an insight to quasiparticle properties of strongly correlated magnets and can become a valuable tool for studying material science.

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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