Coherent Microwave Emission Using Cavity Magnonics
Abstract: Cavity Magnonics is an emerging field studying the light-matter interactions involving cavity photons and magnons [1]. Via the quantum physics of spin-photon entanglement on the one hand, and classical electrodynamic coupling on the other, magnon-photon coupling connects some of the most exciting modern physics, such as quantum information and quantum optics, with one of the oldest science on the earth, the magnetism [2].
This talk reports our latest progress in this frontier. By developing a gain-embedded cavity magnonics platform [3], we create a gain-driven polariton (GDP) that is activated by an amplified electromagnetic field. Utilizing the gain-sustained photon coherence of the GDP, we demonstrate polariton-based coherent microwave amplification (~ 40 dB) and achieve high-quality coherent microwave emission (Q > 109), which exceed the performance of spin-torque oscillators and many state-of-the-art masers.
[1] Michael Harder, et al., “Coherent and Dissipative Cavity Magnonics”, J. Appl. Phys. 129, 201101 (2021) (invited tutorial).
[2] Babak Zare Rameshti, et al., “Cavity Magnonics”, Physics Reports, 979, 1-61 (2022).
[3] Bimu Yao, Y.S. Gui, J.W. Rao, Y.H. Zhang, Wei Lu, and C.-M. Hu, “Coherent Microwave Emission of a Gain-Driven Polariton”, Phys. Rev. Lett., 130, 146702 (2023) (Editor’s Suggestion).
Bio: Can-Ming Hu is a Distinguished Professor at the University of Manitoba in Canada. He graduated from Fudan University in 1988, obtained his Ph.D. from the University of Würzburg in 1995, and received a Habilitation degree from the University of Hamburg in 2005. He served as an IEEE Magnetics Society’s Distinguished Lecturer (2018) and a Co-Chair of the Physics Evaluation Groups of NSERC Canada (2021-2022). He is a Fellow of the American Physical Society and an Outstanding Referee for APS journals. His group is now studying Cavity Magnonics and developing magnon-based microwave devices.
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