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Revisiting the coupled oscillator - applications in spin cavitronics

Tuesday, 2020, January 7 - 10:00
School of Physics and Technology
Jiang Xiao

Professor Jiang Xiao graduated from the Department of Physics of Peking University in 2001. He studied in Georgia Institute of Technology from 2001 to 2006 and received his master degree in Applied Mathematics and doctoral degree in Physics. From 2006 to 2009, he was engaged in postdoctoral research at Delvotte University of Technology in the Netherlands. In 2009, he returned to China and joined the Physics Department of Fudan University. In 2017, he was selected into the National Science Fund for Outstanding Youth. He is mainly engaged in the research of spin electronics theory, and has made influential achievements in spin transfer torque, spin Seebeck effect, spin pump effect, etc. Recently, his researches mainly focus on spin wave regulation, aiming to realize the non-volatile calculation principle of low energy consumption by using spin wave. His recent achievements have been published in the journals of Phys. Rev. Lett, Phys. Rev. X, Phys. Rev. B, nature communications, etc.

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, I will show that the physics of the coupled oscillators strongly depend on nature of the coupling force, which does not have to be conservative [1]. 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, I will demonstrate how it manifests itself in the field of spin cavitronics, which studies the interaction between the magnetic order and electromagnetic waves in microwave cavities.


[1]. Yu, W., Wang, J., Yuan, H. Y. & Xiao, J. Prediction of Attractive Level Crossing via a Dissipative Mode.Phys. Rev. Lett.123, 227201 (2019).