Liu Zheyuan, Ozeki Makoto, Asai Shinichiro, Itoh Shinichi, Masuda Takatsugu
Institute for Solid State Physics, <a href="https://ror.org/057zh3y96">The University of Tokyo</a>, Kashiwa 277-8581, Japan.
<a href="https://ror.org/0327y7e25">Institute of Materials Structure Science</a>, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan.
Phys Rev Lett. 2024 Oct 11;133(15):156702. doi: 10.1103/PhysRevLett.133.156702.
Altermagnetism is a newly recognized magnetic class named after the alternating spin polarizations in both real and reciprocal spaces. Like the spin splitting of electronic bands, the magnon bands in altermagnets are predicted to exhibit alternating chiral splitting. In this work, by performing inelastic neutron scattering on α-MnTe, we directly observed the altermagnetic magnon splitting. The lifted degeneracy of magnons is well explained by a symmetric-exchange origin. Further calculation based on the obtained spin-wave model demonstrates the magnons are chiral split as well. In addition, the g-wave magnetism was experimentally identified in MnTe.
交替磁性是一种新发现的磁性类别，以实空间和倒易空间中的交替自旋极化命名。与电子能带的自旋分裂类似，交替磁体中的磁振子能带预计会表现出交替的手性分裂。在这项工作中，通过对α-MnTe进行非弹性中子散射，我们直接观测到了交替磁性磁振子分裂。磁振子简并的解除可以用对称交换起源很好地解释。基于所获得的自旋波模型的进一步计算表明，磁振子也存在手性分裂。此外，在MnTe中通过实验确定了g波磁性。
