论文标题
从破碎的时间逆转对称性中的手性声子在CRI $ _3 $中分裂
Frequency splitting of chiral phonons from broken time reversal symmetry in CrI$_3$
论文作者
论文摘要
基于静态原子质力的晶格动力学的常规方法无法完全解释磁系统中时间上对称性破坏的影响。纠正此方法的最新方法涉及将力的一阶变化与原子速度的一阶变化合并，这是在电子自由度的绝热分离的假设下。在这项工作中，我们开发了一种第一原理方法，以在扩展固体中计算这种速度效率耦合，并通过铁电磁cri $ _3 $显示，由于系统中旋转的缓慢动力学的缓慢，因此对绝热分离的假设可能会导致大量错误的划分，从而对区域内分位数的份额进行了巨大的错误。我们证明了对晶格动力学的准确描述需要在同一基础上处理木蛋白和声子。
Conventional approaches for lattice dynamics based on static interatomic forces do not fully account for the effects of time-reversal-symmetry breaking in magnetic systems. Recent approaches to rectify this involve incorporating the first-order change in forces with atomic velocities under the assumption of adiabatic separation of electronic and nuclear degrees of freedom. In this work, we develop a first-principles method to calculate this velocity-force coupling in extended solids, and show via the example of ferromagnetic CrI$_3$ that, due to the slow dynamics of the spins in the system, the assumption of adiabatic separation can result in large errors for splittings of zone-center chiral modes. We demonstrate that an accurate description of the lattice dynamics requires treating magnons and phonons on the same footing.
