Antiferromagnetic Resonance Revisited: Dissipative Coupling without Dissipation
Abstract
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 -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.
Cite
@article{arxiv.2111.09682,
title = {Antiferromagnetic Resonance Revisited: Dissipative Coupling without Dissipation},
author = {Yutian Wang and Jiang Xiao},
journal= {arXiv preprint arXiv:2111.09682},
year = {2021}
}