Title: Revisiting the coupled oscillator - applications in spin cavitronics
Speaker: Prof. Jiang Xiao
Department of Physics, Fudan University
Time: 2020.01.07 10:00 AM
Location: Room 437, Xingjian Building
Host：School of Physics Science & Technology
Prof. Jiang Xiao received his B. S. in Physics from Peking University in 2001, and Ph. D. from Georgia Institute of Technology in 2006. After a postdoctoral research in Kavli Institute of NanoScience at Delft University of Technology in The Netherlands, he joined Fudan University in 2009. His research is on the theoretical condensed matter physics, and focuses on spintronics, including spin transport in magnetic nanostructures, magnetization dynamics, parametric pumping, and more recently on magnonics and spin cavitronics.
Coupled harmonic oscillators appear repeatedly in a wide range of physical problems and are common fare in undergraduate physics. Can there be anything new in such a simple and well-studied system? In this talk, Prof. Xiao presented their recent observation that the physics of the coupled oscillators strongly depend on nature of the coupling force, which does not have to be conservative. The coupling via non-conservative forces, or dissipative coupling, leads to dynamic behavior that may be very different from common expectations. After discussing the physics of dissipative coupling in mechanical oscillators and electronic RLC oscillators, Prof. Xiao demonstrated how it manifests itself in the field of spin cavitronics, which studies the interaction between the magnetic order and electromagnetic waves in microwave cavities.
Yu, W., Wang, J., Yuan, H. Y. & Xiao, J. Prediction of Attractive Level Crossing via a Dissipative Mode. Phys. Rev. Lett. 123, 227201 (2019).