Chiral phonons with atomic rotations converted into electron spins result in a change of spin magnetizations in crystals. In this paper, we investigate a new conversion of chiral phonons into magnons both in ferromagnets and antiferromagnets by spin models with exchange and Dzyaloshinskii–Moriya interactions. The atomic rotations in chiral phonons are treated as slow phonons, which modulate spin–spin interaction and induce time-dependent magnon excitations due to geometric effect within adiabatic approximation. We demonstrate that a non-trivial change of the number of magnons requires breaking of the spin-rotation symmetry around the spin quantization axis. As a result, the clockwise and counterclockwise chiral phonons induce a change of the magnon number with opposite signs, which corresponds to an increasing or decreasing spin magnetization due to the chiral nature of the atomic rotations. In particular, in antiferromagnets, the modulation of magnons due to chiral phonons generates a non-zero net magnetization by the proposed effect, which is expect to be observed in experiments.

中文翻译：

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铁磁体和反铁磁体中手性声子转化为磁振子

原子旋转转化为电子自旋的手性声子导致晶体中自旋磁化强度的变化。在本文中，我们通过交换和 Dzyaloshinskii-Moriya 相互作用的自旋模型研究了铁磁体和反铁磁体中手性声子向磁振子的新转换。手性声子中的原子旋转被视为慢声子，它调节自旋-自旋相互作用，并由于绝热近似内的几何效应而引起时间依赖性磁振子激发。我们证明，磁振子数量的重大变化需要打破围绕自旋量化轴的自旋旋转对称性。结果，顺时针和逆时针手性声子引起磁振数具有相反符号的变化，这对应于由于原子旋转的手性性质而导致的自旋磁化强度的增加或减少。特别是，在反铁磁体中，由于手性声子引起的磁振子调制通过所提出的效应产生非零净磁化强度，预计将在实验中观察到。