AI 中文总结
该研究揭示RMn6Sn6类亚铁磁体中存在随动量变化的手性磁振子混合模式，其能带交叉可通过调控对称性实现节点线或带隙化，为手性磁振子调控提供新途径。
AI 中文摘要
铁磁体中的磁振子具有由磁矩绕磁化方向右旋进动定义的自旋角动量；无净磁化的反铁磁体中，无外场时左右旋磁振子简并。亚铁磁体具有未补偿的磁亚晶格，本应天然存在左右旋磁振子，其能量因内部分子场分裂。本文表明，RMn6Sn6（R=Tb、Er）亚铁磁体的基平面内，有限动量k处左右旋磁振子能带交叉，形成具有相反动力学手性的模式。亚铁磁有序的对称性可通过改变稀土磁各向异性或外场调控，能带交叉可保持为节点线或带隙化；带隙模式包含杂化手性激发，其手性随k变化。
英文摘要
Magnons in ferromagnets possess spin angular momentum defined by right-handed precession of the moment around the magnetization direction. In antiferromagnets with no net magnetization, left-and right-handed magnons are degenerate in the absence of an applied field. Ferrimagnets possess uncompensated magnetic sublattices, which should natively possess right-and left-handed magnons where their energy is split by the internal molecular field. Here, we show that RMn6Sn6 (R = Tb, Er) ferrimagnets possess right and left-handed magnon bands that cross at finite momentum (k) within the basal plane, defining modes with opposite dynamical chirality. Depending on the symmetry of the ferrimagnetic order, which may be manipulated by varying the rare-earth magnetic anisotropy or with applied field, the band crossing may remain a nodal line or may be gapped. The gapped modes contain hybridized chiral excitations whose chirality becomes k-dependent.
Journal refPhys. Rev. Lett. 137, 046702 (2026)
