AI 中文总结
研究交变磁α-MnTe自旋波谱的磁场依赖性，用非弹性中子散射和线性自旋波理论，发现面内磁场重定向奈耳矢量，磁振子能量和线宽不变，光谱强度改变，证明反铁磁序与磁振子谱分离，使其成为可重构磁振子耦合平台。
AI 中文摘要
交变磁序即使在没有净磁化的情况下也会引起电子和磁振子激发的动量依赖自旋分裂。在此，我们使用非弹性中子散射和线性自旋波理论研究交变磁α-MnTe自旋波谱的磁场依赖性。面内磁场通过克服弱晶体各向异性连续重新定向奈耳矢量，与主要交换尺度相比仍较小。我们发现这种重新定向使磁振子能量和线宽基本不变，但通过横向动量投影强烈改变测量的光谱强度。我们的结果表明反铁磁序的软取向自由度与稳健的交换主导手征磁振子谱之间有明显分离。这种组合使α-MnTe成为可重构磁振子耦合的平台，外部场可调节激发与极化探针的相互作用方式而基本不改变其频率或相干性。
英文摘要
Altermagnetic order gives rise to momentum-dependent spin splitting of electronic and magnonic excitations even in the absence of a net magnetization. Here, we investigate the magnetic field dependence of the spin-wave spectrum of altermagnetic $α$-MnTe using inelastic neutron scattering and linear spin-wave theory. An in-plane magnetic field continuously reorients the Néel vector by overcoming the weak crystalline anisotropy, while remaining small compared with the dominant exchange scale. We find that this reorientation leaves the magnon energies and line widths essentially unchanged, but strongly modifies the measured spectral intensity through the transverse-momentum projection. Our results demonstrate a clear separation between the soft orientational degree of freedom of the antiferromagnetic order and the robust exchange-dominated chiral magnon spectrum. This combination establishes $α$-MnTe as a platform for reconfigurable magnon coupling, in which external fields tune how excitations interact with polarized probes without substantially altering their frequency or coherence.
Comments9 pages, 5 figures
