再论反铁磁共振：无耗散的耗散耦合
Antiferromagnetic Resonance Revisited: Dissipative Coupling without Dissipation
摘要：
反铁磁体是一个封闭的厄米特系统，我们发现它的激发，即使在没有耗散的情况下，也可以看作是一个具有耗散耦合的非厄米特系统。因此，反铁磁共振谱不显示典型的水平排斥，但显示水平吸引-一个特征行为，经常在非厄米系统中观察到。这种行为是因为反铁磁基态是$\mathcal{PT}$对称的。这种对反铁磁共振的新认识也解释了反铁磁阻尼率的神秘增强现象。由于反铁磁振子是有效的非厄米体，因此可以用于产生量子纠缠，而不需要引入第三方，如外部泵浦。
英文摘要：
The antiferromagnet is a closed Hermitian system, we find that its excitations, even in the absence of dissipation, can be viewed as a non-Hermitian system with dissipative coupling. Consequently, the antiferromagnetic resonance spectrum does not show the typical level repulsion, but shows the level attraction -- a characteristic behavior often observed in non-Hermitian systems. Such behavior is because the antiferromagnetic ground state is $\mathcal{PT}$-symmetric. This new understanding on antiferromagnetic resonance also explains the mysterious enhancement of antiferromagnetic damping rate. Being effectively non-Hermitian, antiferromagnetic magnons can be used for quantum entanglement generation without introducing a third party like external pumping.
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