蜂窝反铁磁体中手性四自旋交换产生的奇宇称磁振子自旋极化
Odd-parity magnon spin polarization from chiral four-spin exchange in a honeycomb antiferromagnet
浏览论文内容
中文总结 AI 辅助
本文提出手性四自旋交换在蜂窝反铁磁体中产生动量依赖的磁振子自旋，温度梯度可沿Néel轴诱导自旋密度，且反转耦合可反转自旋而不改变能量。
中文摘要 AI 辅助
在零磁场下，手性四自旋交换在补偿的蜂窝反铁磁体中产生动量相关的磁振子自旋。对于与层法线倾斜角度为$\theta_0$的Néel矢量，该相互作用在谐波阶已经对子格间磁振子配对有贡献，其振幅正比于$\cos\theta_0\sin^2\theta_0$。双轴各向异性混合了两个纵向自旋扇区，产生动量奇宇称的非量子化模式自旋，而子格交换关系保持磁振子能量互为倒数。温度梯度随后通过磁振子占据数的重新分布沿Néel轴诱导自旋密度。反转四自旋耦合会反转该自旋密度和模式自旋，而不改变磁振子能量。MnPS$_3$启发了这种磁几何结构；实现该相互作用需要与模型对称性假设相容的结构修饰。
英文摘要
Chiral four-spin exchange generates a momentum-dependent magnon spin in a compensated honeycomb antiferromagnet at zero magnetic field. For a Néel vector tilted by an angle $θ_0$ from the layer normal, the interaction contributes to intersublattice magnon pairing already at harmonic order, with an amplitude proportional to $\cosθ_0\sin^2θ_0$. Biaxial anisotropy mixes the two longitudinal-spin sectors, producing nonquantized mode spins that are odd in momentum, while a sublattice-exchange relation keeps the magnon energies reciprocal. A temperature gradient then induces a spin density along the Néel axis through a redistribution of magnon occupations. Reversing the four-spin coupling reverses this spin density and the mode spins without changing the magnon energies. MnPS$_3$ motivates the magnetic geometry; realizing the interaction requires a structural modification compatible with the symmetry assumptions of the model.
发表机构
- ThermoFisher Scientific（赛默飞世尔科技）
- Radboud University（拉德堡德大学）
机构由 AI 辅助整理，请以论文原文为准。
