学术报告：Critically-Driven Cavity Magnonics

主讲人：胡灿明 教授  加拿大曼尼托巴大学

时间：2024年5月24日（周五） 14：30 - 16：00

地点：物理学院7楼量子报告厅

主持人：柏利慧

Critically-Driven Cavity Magnonics

Can-Ming Hu

Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada R3T 2N2

hu@physics.umanitoba.ca

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 presentation outlines our most recent advancement in this field through the creation of a critically-driven cavity magnonics platform [3], which has enabled strong coupling [4] over a long distance mediated by traveling-photons — a capability unattainable previously. Notably, the experiment revealed striking anomalies: the coupling strength oscillated at double the period observed in conventional photon-mediated coupling, and exhibited distinct mode splitting within the cavity’s linewidth. These findings challenge existing coupled-mode theories, and the experimental result shows the potential of exploiting critical phenomena to build magnonics network over large distances, which could pave a way for developing quantum internet.

[1] Michael Harder, Bimu Yao, Yongsheng Gui, and Can-Ming Hu,

“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] Ying Yang, Jiguang Yao, Yang Xiao, Pak-Tik Fong, Hoi-Kwan Lau, and C.-M. Hu:

"Anomalous Long-Distance Coherence in Critically-Driven Cavity Magnonics",

Phys. Rev. Lett., in print (2024). [https://arxiv.org/abs/2404.13190].

[4] Lihui Bai, M. Harder, Y. P. Chen, X. Fan, J. Q. Xiao, and C.-M. Hu:

“Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems”,

Phys. Rev. Lett., 114, 227201 (2015). (Editor's Suggestion)

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.