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arXiv 2302.12290cond-mat.mes-hall
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腔量子材料量子 Floquet 工程中的光-物质关联

Light-matter correlations in Quantum Floquet engineering of cavity quantum materials

Beatriz Pérez-González, Gloria Platero, Álvaro Gómez-León

AI总结:

本文提出适用于任意耦合强度的非微扰 Hamiltonian 截断方案,揭示腔 QED 材料中光-物质关联会改变 SSH 链手征对称性、边缘态鲁棒性及光子谱函数。

摘要:

量子 Floquet 工程(QFE)旨在将利用经典外场控制量子系统的方法——即广为人知的半经典 Floquet 工程(SCFE)——推广到量子场。然而,为了在任意耦合强度下忠实地捕捉物理现象,需要对腔 QED 材料中的光-物质相互作用给出规范不变的描述,这使得 Hamiltonian 在光子算符上高度非线性。我们提出了一种该 Hamiltonian 的非微扰截断方案,它对任意耦合强度均有效,并利用其研究 SCFE 中所缺失的光-物质关联的作用。我们发现,即使在高频区域,光-物质关联也可能至关重要,尤其是对于系统的拓扑性质。作为示例,我们表明对于与腔耦合的 SSH 链,光-物质关联会破坏该链原有的手征对称性,强烈影响其边缘态的鲁棒性。此外,我们展示了光-物质关联如何印记在光子谱函数中,并讨论了它们与能带拓扑之间的关系。

英文摘要:

Quantum Floquet engineering (QFE) seeks to generalize the control of quantum systems with classical external fields, widely known as Semi-Classical Floquet engineering (SCFE), to quantum fields. However, to faithfully capture the physics at arbitrary coupling, a gauge-invariant description of light-matter interaction in cavity-QED materials is required, which makes the Hamiltonian highly non-linear in photonic operators. We provide a non-perturbative truncation scheme of the Hamiltonian, which is valid or arbitrary coupling strength, and use it to investigate the role of light-matter correlations, which are absent in SCFE. We find that even in the high-frequency regime, light-matter correlations can be crucial, in particular for the topological properties of a system. As an example, we show that for a SSH chain coupled to a cavity, light-matter correlations break the original chiral symmetry of the chain, strongly affecting the robustness of its edge states. In addition, we show how light-matter correlations are imprinted in the photonic spectral function and discuss their relation with the topology of the bands.

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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