Title: Driven Cavity Magnonics

Speaker: Can-Ming Hu

Time: 15:30, May 30

Location: Room 215, No. 8 Hainayuan Building

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].

Beginning with a pedagogical and general introduction, this presentation showcases our recent progress in this field, achieved through the development of two dynamically driven platforms in cavity magnonics. Utilizing the combined properties of the van der Pol oscillator and Duffing oscillator, I will highlight the innovative physics of gain-driven light-matter interaction. This study has facilitated the creation and prototyping of both a coherent microwave source and a coherent microwave amplifier [3]. Additionally, we extend our inquiry into the frontier of dissipative couplings [4], exploring the physics of critically-driven light-matter interaction. This endeavor has led to the unexpected revelation of an anomalous long-distance magnon-photon coherence spanning over 2 meters [5].

[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, et al., “Coherent Microwave Emission of a Gain-Driven Polariton”, Phys. Rev. Lett., 130, 146702 (2023) (Editor’s Suggestion). 

[4] Yi-Pu Wang, and Can-Ming Hu, “Dissipative couplings in cavity magnonics”, J. Appl. Phys. 127, 130901 (2020) (Invited Perspective; Editor's Pick).

[5] Ying Yang, “Dissipative coupling in cavity magnonics”, PhD thesis (2023), University of Manitoba. 

Biography:

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.