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arXiv 2106.02178cond-mat.mes-hall
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易平面反铁磁绝缘体中补偿磁场附近的磁振子自旋输运

Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators

Ka Shen

摘要:

本文从理论上研究了面内磁场作用下易平面反铁磁绝缘体中的磁振子自旋输运。通过对磁振子谱的精确计算,我们发现由于磁各向异性引起的能带分裂可以被特定强度的外场完全补偿,这使得它的动力学行为几乎等价于易磁化轴反铁磁体。结果,由于偶极-偶极相互作用,先前在易轴反铁磁体中预测的内禀磁振子自旋霍尔效应在易平面反铁磁体中被激活。补偿功能还允许磁场控制的磁振子自旋寿命,因此自旋扩散长度。补偿功能是强大的双轴各向异性。

英文摘要:

In this work, we theoretically study the magnon spin transport in easy-plane antiferromagnetic insulators in the presence of an in-plane magnetic field. By exactly calculating the magnon spectrum, we find the band splitting due to the magnetic anisotropy can be fully compensated by the external field at a particular strength, which makes its dynamics nearly equivalent to an easy-axis antiferromagnet. As a result, the intrinsic magnon spin Hall effect due to the dipole-dipole interaction, previously predicted in easy-axis antiferromagnets is activated in easy-plane antiferromagnets. The compensation feature also allows the field control of magnon spin lifetime and hence the spin diffusion length. The compensation feature is robust against the biaxial anisotropy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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