Observation of the exceptional point in cavity magnon-polaritons

Dengke Zhang, Xiao-Qing Luo, Yi-Pu Wang, Tie-Fu Li () and J. Q. You ()
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Dengke Zhang: Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center
Xiao-Qing Luo: Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center
Yi-Pu Wang: Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center
Tie-Fu Li: Tsinghua University
J. Q. You: Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Magnon–polaritons are hybrid light–matter quasiparticles originating from the strong coupling between magnons and photons. They have emerged as a potential candidate for implementing quantum transducers and memories. Owing to the dampings of both photons and magnons, the polaritons have limited lifetimes. However, stationary magnon–polariton states can be reached by a dynamical balance between pumping and losses, so the intrinsically nonequilibrium system may be described by a non-Hermitian Hamiltonian. Here we design a tunable cavity quantum electrodynamics system with a small ferromagnetic sphere in a microwave cavity and engineer the dissipations of photons and magnons to create cavity magnon–polaritons which have non-Hermitian spectral degeneracies. By tuning the magnon–photon coupling strength, we observe the polaritonic coherent perfect absorption and demonstrate the phase transition at the exceptional point. Our experiment offers a novel macroscopic quantum platform to explore the non-Hermitian physics of the cavity magnon–polaritons.

Date: 2017
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DOI: 10.1038/s41467-017-01634-w

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