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Nonreciprocal singularities dominated by the dissipative photon-magnon coupling in non-Hermitian systems

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arxiv 2405.17869 v2 pith:HFADZ6GT submitted 2024-05-28 cond-mat.mes-hall cond-mat.other

Yongzhang Shi , Chi Zhang , Zhenhui Hao , Changjun Jiang , C.K. Ong , Ke Xia , Guozhi Chai This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.other
keywords couplingexceptionalsingularitiessystemcavitydifferentdissipativedominated
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We investigated the magnon-photon coupling in an open cavity magnonic system, which leads to two different nonreciprocal singularities dominated by the dissipative coupling. One type of singularity is the exceptional point, which is just on the exceptional surface in parameter space. The other type of singularity is the bound state in the continuum discovered in the level-attraction-like coupling, which is above the exceptional surface. In experiment, we realized the two different singularities with nonreciprocity and selectivity in an open cavity magnonic system with suitable dissipation rating. Our results can be understood well with the pseudo-Hermitian theory of magnon-polariton system.

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  1. Continuously controllable dissipative and coherent couplings by the interaction between anti-resonance and multiple magnons

    cond-mat.mes-hall 2025-01 conditional novelty 6.0 of 10

    A single anti-resonance mode can couple coherently or dissipatively to different magnon modes depending on the strength of the microwave magnetic field at the magnon position, enabling magnetic-field-selective microwa...

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