声子磁体：声子角动量的自发有序
The phonomagnet: Spontaneous order of phonon angular momentum
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中文总结 AI 辅助
本研究提出声子角动量自发有序可产生新型磁性，即声子磁性，源于自旋-声子角动量耦合，并预测VI$_3$为候选声子磁体，为皮秒级信息存储提供新平台。
中文摘要 AI 辅助
磁性是物质的基本属性，通常源于电子自旋和轨道角动量的集体有序。其他准粒子与磁性相互作用，但尚未被视为磁性的主要来源。在此，我们证明声子可以通过其角动量的自发有序产生一种独特的磁性形式。这种声子磁性源于自旋-声子角动量耦合，在局域离子角动量之间产生有效的交换相互作用。我们表明，相互作用强度取决于自旋磁化率，并预测在铁磁临界点附近存在声子磁相。我们的理论还揭示了既有自旋模型的声子类比，包括声子海森堡模型、声子Γ模型和声子Dzyaloshinskii-Moriya相互作用。结合第一性原理声子计算与最近的拉曼光谱数据，我们确定VI$_3$为候选声子磁体，为解释其体铁磁转变以上报告的弱磁异常提供了微观框架。这些发现为在皮秒时间尺度上进行信息存储和操控开辟了新平台。
英文摘要
Magnetism is a fundamental property of matter, typically arising from collective ordering of electronic spin and orbital angular momentum. Other quasiparticles interact with magnetism. However, they have not been considered its primary source. Here we show that phonons can generate a distinct form of magnetism through spontaneous ordering of their angular momentum. This phonomagnetism emerges from spin-phonon angular-momentum coupling, producing an effective exchange interaction between local ionic angular momenta. We show that the interaction strength depends on spin susceptibility, with a phonomagnetic phase predicted near a ferromagnetic critical point. Our theory also reveals phononic analogues of established spin models, including phonon Heisenberg, phonon $Γ$-model, and phonon Dzyaloshinskii-Moriya interactions. Combining first-principles phonon calculations with recent data from Raman spectroscopy, we identify VI$_3$ as a candidate phonomagnet, providing a microscopic framework for interpreting the weak magnetic anomaly reported above its bulk ferromagnetic transition. These findings open avenues for new platforms for information storage and manipulation on picosecond timescales.
发表机构
- Chalmers University of Technology（查尔姆斯理工大学）
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