AI 中文总结
研究交变磁体超快动态操纵，通过相干声子诱导选择性对称性破缺实现磁控，以α-MnTe为例展示B₁g模式激发驱动超快转变，还证明机制广泛适用，阐明相干声子控制交变磁体自旋分裂获非平衡特性的潜力。
AI 中文摘要
交变磁体在电子结构中具有由对称性决定的非平凡自旋分裂，有望用于下一代自旋电子学，但其超快动态操纵在很大程度上仍未被探索。本文通过相干声子诱导的选择性对称性破缺，将交变磁声子学确立为一种有效的磁控途径。以典型交变磁体α-MnTe为例，证明B₁g模式的靶向激发选择性地解除了保护交变磁性的对称性约束，驱动超快转变为具有全局自旋分裂且无净磁化的瞬态补偿亚铁磁（cFiM）相。此外，通过展示多模式对称性破缺途径以及在金属CrSb中实现具有可逆磁矩的亚铁磁序，表明该机制具有广泛适用性。这些发现阐明了通过对自旋分裂进行相干声子控制在交变磁体中获得理想非平衡特性的潜力。
英文摘要
Altermagnets feature symmetry-dictated nontrivial spin splitting in electronic structure promising for next-generation spintronics, yet their ultrafast dynamical manipulation remains largely unexplored. Here, we establish altermagnetophononics as an efficient route for magnetic control via selective symmetry breaking induced by coherent phonons. Using the prototypical altermagnet $α$-MnTe as an example, we demonstrate that the targeted excitation of B$_{1g}$ mode selectively lifts the symmetry constraints protecting altermagnetism (AM), driving ultrafast transition into a transient compensated ferrimagnetic (cFiM) phase characterized by a global spin splitting without net magnetization. Further, we show that the proposed mechanism is broadly applicable by demonstrating a multi-mode symmetry breaking pathway, and by realizing a ferrimagnetic order with reversible magnetic moment in metallic CrSb. These findings elucidate the potential to obtain desirable nonequilibrium properties in altermagnets via coherent phononic control over their spin splittings.
Comments6 pages, 5 figures
