Physics Colloquium - Coherent Microwave Emission Using Cavity Magnonics
Friday, March 15, 2024 - 3:00pm to 4:00pm
DeMeritt Hall - Rm. 240
Title: Coherent Microwave Emission Using Cavity Magnonics
Presenter: Can-Ming Hu - University of Manitoba
Host: Jiadong Zang - Professor
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).
Please contact Michelle Mancini for Zoom link at michelle.mancini@unh.edu