Level Attraction Due to Dissipative Magnon-Photon Coupling

Harder, Michael; Yang, Yunyi; Yao, Bing; Yu, Chenhui; Rao, J. W.; Gui, Y. S.; Stamps, R. L.; Hu, C.‐M.

doi:10.1103/physrevlett.121.137203

Cited by 302 publications

(249 citation statements)

References 41 publications

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“…Recently, a number of experiments [47][48][49][50] suggest the quasiparticles energyies Re[E] can cross each other in non-Hermitian systems, instead of anti-crossing universally arising in all Hermitian Hamiltonians. This remarkable phenomenon is termed as level attraction [51].…”

Section: Introductionmentioning

confidence: 99%

Level statistics of extended states in random non-Hermitian Hamiltonians

Wang¹,

Wang

2020

Phys. Rev. B

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Absence of level repulsion between extended states in random non-Hermitian systems is demonstrated. As a result, the general Wigner-Dyson distributions of level spacing of diffusive metals in the usual Hermitian systems is replaced by the Poisson distribution for quasiparticle level spacing of non-Hermitian disordered metals in the thermodynamic limit of infinite system size. This is a very surprising result because Poisson statistics is universally true for the Anderson insulators where energy eigenstates do not overlap with each other so that energy levels are independent from each other. For disordered metals where different eigenstates overlap with each other, one should expect different levels trying to stay away from each other so that the Poisson distribution should not apply there. Our results show that the larger non-Hermitian energy (dissipation) can invalidate level repulsion principle that holds dearly in quantum mechanics. Thus, our theory provides a unified picture for recent discovery of so called "level attraction" in various systems. It provides also a theoretical basis for manipulating energy levels.arXiv:2003.02492v1 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Level statistics of extended states in random non-Hermitian Hamiltonians

Wang¹,

Wang

2020

Phys. Rev. B

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“…Experimentally, people often avoid placing magnetic samples at rf magnetic (h-) field nodes of a cavity mode, as here coherent magnon-photon coupling vanishes. However, dissipative coupling could dominate near this condition, where the cavity Lenz effect produces a microwave current that impedes the magnetization dynamics [25]. Instead of level repulsion with mode anticrossing seen in coherently coupled magnon-photon systems, dissipative coupled systems exhibit level attraction with a coalescence of hybridized magnon-photon modes [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…However, dissipative coupling could dominate near this condition, where the cavity Lenz effect produces a microwave current that impedes the magnetization dynamics [25]. Instead of level repulsion with mode anticrossing seen in coherently coupled magnon-photon systems, dissipative coupled systems exhibit level attraction with a coalescence of hybridized magnon-photon modes [25][26][27]. Alternatively, Grigoryan and Xia have proposed an approach to explore level attraction [28] in hybrid magnon-photon systems, by modulating the relative phase [29] between coherent microwaves, and very recently Boventer et al [30] reported level attraction in these systems.…”

Section: Introductionmentioning

confidence: 99%

“…The previous work [25], has reported the first discovery of level attraction in the coupled cavity magnon system and studied its physical origin. However, it still left a few important questions open.…”

Section: Introductionmentioning

confidence: 99%

“…However, it still left a few important questions open. Firstly, the experiment of [25] was performed by using a special 1D Fabry-Perot-like cavity, which consists of a Ku-band circular waveguide with two circular-rectangular transitions. Considering the promising applications of level attraction, it is of high interest to study whether level attraction may ubiquitously exist in other cavity systems.…”

Section: Introductionmentioning

confidence: 99%

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Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Rao

Zhao

et al. 2019

New J. Phys.

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We report on coherent and dissipative coupling between a magnon mode and an anti-resonance of transmission in a cylindrical microwave cavity. By effectively suppressing coherent coupling, we observe the hybridized dispersion to change from level repulsion to level attraction. A careful examination reveals distinct differences in the line shape and phase evolution of transmission spectra between these coupling behaviors. For a quantitative understanding of the interactions between the magnon mode and the cavity anti-resonance, we develop a model which precisely describes our experimental observations, particularly, the signature in the line shape and phase of the microwave transmission. Our work sets a foundation for understanding strong coupling between magnon modes and cavity anti-resonances. In addition, it also confirms the ubiquity of level attraction in coupled magnon-photon systems, which may be helpful to develop future magnon-based hybrid quantum systems.

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Auxiliary Mode Mediated Coherent and Complex Couplings in a Cavity Magnonic System

Wang

2022

Annalen der Physik

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Coherent and dissipative couplings are discovered in hybrid systems, which are frequently shown as the level repulsion and level attraction between the coupled modes, respectively. The coherent coupling can come from the direct dipole-dipole interaction or resonance-mediated virtual photon exchange. The dissipative coupling originates from the bath-induced cooperative damping effect. The interplay between these two couplings gives rise to complex coupling, contributing to novel phenomena and applications. In this work, it is studied how coherent and complex couplings can be readily realized and manipulated in a three-mode cavity magnonic system. The three-mode system consists of a two-port cavity, a yttrium iron garnet (YIG) sphere (magnon mode), and a split-ring resonator (auxiliary mode). A tunable split-ring resonator mediates the coupling between the cavity mode and magnon mode. The coupling effect is theoretically analyzed by solving the steady-state equation combined with numerical simulation. By adjusting several system parameters, the coherent and complex couplings mediated by the auxiliary mode are revealed. The study paves the way toward exploiting resonance-and dissipation-induced couplings in hybrid systems.

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Level Attraction Due to Dissipative Magnon-Photon Coupling

Cited by 302 publications

References 41 publications

Level statistics of extended states in random non-Hermitian Hamiltonians

Level statistics of extended states in random non-Hermitian Hamiltonians

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Auxiliary Mode Mediated Coherent and Complex Couplings in a Cavity Magnonic System

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