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Microscopic mechanism of level attraction
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The emerging level attraction from dissipative light-matter coupling converges the typical Rabi-splitting feature from coherent coupling and exhibits potentials in topological information processing. However, the underlying microscopic quantum mechanism of dissipative coupling still remains unclear, which brings difficulties in quantifying and manipulating coherence-dissipation competition and thereby the flexible control of level attraction. Here, by coupling magnon to a cavity supporting both standing and travelling waves, we identify the travelling-wave state to be responsible for magnon-photon dissipative coupling. By characterizing radiative broadening of magnon linewidth, we quantify the coherent and dissipative coupling strengths and their competition. The effective magnon-photon coupling strength, as a net result of competition, is analytically presented in quantum theory to show good agreement with measurements. In this manner, we extend the control dimension of level attraction by tuning field torque on magnetization or global cavity geometry. Our finding opens new routines to engineer coupled harmonic oscillator system.
Forward citations
Cited by 4 Pith papers
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Nonreciprocity and Unidirectional Invisibility in Cavity Magnonics
Interference of coherent and dissipative magnon-photon couplings in an open cavity produces nonreciprocal microwave transmission and unidirectional invisibility at zero-damping conditions.
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Chiral coupling of magnons in waveguides
Chiral magnon-photon coupling in a rectangular waveguide enables nonreciprocal magnon-magnon interactions and edge-localized superradiant modes in chains of ferromagnetic spheres.
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Magnon Accumulation in Chirally Coupled Magnets
Chiral photon-magnon coupling in a waveguide is predicted to drive magnon intensity into one edge of a magnet chain, with amplification over 100-fold as the coupling becomes unidirectional.
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Steering between Level Repulsion and Attraction: Broad tunability of Two-Port Driven Cavity Magnon-Polaritons
A two-port drive with adjustable phase and amplitude continuously steers a cavity-magnon polariton between level repulsion and level attraction.
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