三轴范德华反铁磁体中可调谐的超强磁振子-磁振子耦合与压缩态
Tunable Ultrastrong Magnon-Magnon Coupling and Squeezed States in a Triaxial Van der Waals Antiferromagnet
浏览论文内容
中文总结 AI 辅助
本研究在$CrPS_4$中实现可调超强磁振子-磁振子耦合，建立关联压缩磁振子真空态的方案，为低阻尼二维磁体的非经典磁振子态探测及量子增强自旋电子学提供途径。
中文摘要 AI 辅助
实现并量化超强磁振子-磁振子耦合（USC）仍是量子磁子学的关键挑战。本研究在范德华反铁磁体$CrPS_4$中，实现了手性（右旋与左旋）磁振子模式和声磁振子或光磁振子模式之间宽范围可调的USC。通过全量子模型，将相互作用分解为三个微观相互作用通道：共转项$g_1$（模式杂化）、反转项$g_2$（双模压缩），以及手性区域特有的自平方项$g_3$（介导单模压缩）。归一化耦合比达到$g/f_g$≈0.41，进入USC区域。最关键的是，本研究建立了将这些USC参数与可测量量子现象（压缩磁振子真空态）关联的完整方案。模拟不仅可视化了杂化模式的手性与极化演化，还展示了如何从热噪声驱动的磁化动力学中直接提取正交涨落和高达≈9.7 dB的显著压缩因子。本研究为USC提供了材料特异性量子框架，为在低阻尼二维磁体中探测和利用非经典磁振子态提供了实用途径，为量子增强自旋电子学和混合量子信息平台开辟了道路。
英文摘要
Achieving and quantifying ultrastrong magnon-magnon coupling (USC) remains a key challenge for quantum magnonics. Here, we demonstrate widely tunable USC between chiral (right- and left-handed) and acoustic or optical magnon modes in the van der Waals antiferromagnet $CrPS_4$. Using a full quantum model, we decompose the interaction into three microscopic interaction channels: the co-rotating term $g_1$ (mode hybridization), the counter-rotating term $g_2$ (two-mode squeezing), and, uniquely in the chiral regime, the self-squared term $g_3$ that mediates single-mode squeezing. The normalized coupling ratio reaches $g/f_g$ $\sim$ 0.41, entering the USC regime. Most significantly, we establish a complete protocol linking these USC parameters to a measurable quantum phenomenon: a squeezed magnon vacuum state. Our simulations not only visualize the chirality and polarization evolution of the hybrid modes but also demonstrate how to directly extract quadrature fluctuations and a substantial squeezing factor (up to $\sim$ 9.7 dB) from thermal noise-driven magnetization dynamics. This work provides a material-specific quantum framework for USC and a practical pathway to detect and exploit non-classical magnon states in low-damping two-dimensional magnets, opening a route toward quantum-enhanced spintronics and hybrid quantum information platforms.
发表机构
- National Key Laboratory of Spintronics and School of Physics, Nanjing University（南京大学自旋电子学国家重点实验室和物理学院）
- School of Science, Nanjing University of Posts and Telecommunications（南京邮电大学理学院）
- Laboratory of Solid State Microstructures, Nanjing University（南京大学固体微结构实验室）
- State Key Laboratory of Spintronics, Nanjing University（南京大学自旋电子学国家重点实验室）
机构由 AI 辅助整理，请以论文原文为准。
