CrI$_3$和CrBr$_3$中的声子-磁振子杂化与角动量理论
Theory of phonon-magnon hybridization and angular momentum in CrI$_3$ and CrBr$_3$
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中文总结 AI 辅助
本文构建含杂化刚度矩阵与贝里曲率的约束哈密顿框架，量化CrI$_3$、CrBr$_3$的声子-磁振子杂化程度，探究杂化时角动量在两子系统间的共享特性。
中文摘要 AI 辅助
在磁性材料中，角动量可由不同载流子介导，包括电子、磁振子和声子。若满足特定对称性条件，磁振子可与能量相近的圆偏振声子相互作用；当相互作用足够强时，声子和磁振子会发生频移并混合形成杂化磁弹性准粒子。本文构建了包含杂化刚度矩阵和贝里曲率的约束哈密顿框架，通过总能量分解（对文献中声子原子贡献的范数分解的推广）量化声子与磁振子的杂化程度，CrI$_3$中最高达8%，CrBr$_3$中最高达25%，还探究了杂化时总角动量守恒但在声子和磁振离子系统间共享的特性。
英文摘要
In magnetic materials angular momentum can be mediated by different carriers, including electrons, magnons, and phonons. The magnons can interact with circularly polarized phonons which are close in energy, provided specific symmetry conditions are met. If the interaction is strong enough the phonons and magnons shift in frequency and start to mix to form hybrid magneto-elastic quasi-particles. In this paper, we develop a constrained Hamiltonian framework which incorporates hybrid stiffness matrices and Berry curvatures. We quantify the degree of hybridization between phonons and magnons (up to 8% in CrI$_3$ and 25% in CrBr$_3$) using a decomposition of the total energy, which is a generalization of the norm decomposition for atomic contributions to phonons used in the literature. We also explore how the total angular momentum is conserved but shared between the phononic and magnonic subsystems upon hybridization.
