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arXiv 1702.07977cond-mat.mes-hallcond-mat.mtrl-sci
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反铁磁体中的磁振子-光子耦合

Magnon-photon coupling in antiferromagnets

H. Y. Yuan, X. R. Wang

摘要:

反铁磁体中的磁振子-光子耦合具有许多在铁磁体或亚铁磁体中不存在的吸引人的特征。我们用量子力学的方法证明了,在没有外场的情况下,两个简并自旋波带中的一个与光子耦合,而另一个不与光子耦合。当耦合自旋波与光子模的频率接近时,光子模与耦合自旋波发生交叉。类似于铁磁对应物,磁振子-光子耦合强度与反铁磁体中自旋数$\sqrt{N}$的平方根成正比。外场消除了自旋波简并,两个自旋波带都耦合到光子,导致磁振子和光子之间的两个反交叉。在反交叉频率附近观察到两个透射峰。允许清楚区分两个透射峰的最大阻尼与$\sqrt{N}$成比例,并且它远低于反铁磁绝缘体的阻尼。因此,在反铁磁体中可以实现强磁振子-光子耦合,光子与磁振子之间的相干信息传递是可能的。

英文摘要:

Magnon-photon coupling in antiferromagnets has many attractive features that do not exist in ferro- or ferrimagnets. We show quantum-mechanically that, in the absence of an external field, one of the two degenerated spin wave bands couples with photons while the other does not. The photon mode anticrosses with the coupled spin waves when their frequencies are close to each other. Similar to its ferromagnetic counterpart, the magnon-photon coupling strength is proportional to the square root of number of spins $\sqrt{N}$ in antiferromagnets. An external field removes the spin wave degeneracy and both spin wave bands couple to the photons, resulting in two anticrossings between the magnons and photons. Two transmission peaks were observed near the anticrossing frequency. The maximum damping that allows clear discrimination of the two transmission peaks is proportional to $\sqrt{N}$ and it's well below the damping of antiferromagnetic insulators. Therefore the strong magnon-photon coupling can be realized in antiferromagnets and the coherent information transfer between the photons and magnons is possible.

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