Phys. Rev. B, 109, 184447 (2024)
Bose-Einstein Condensation of Magnons under Coherent Pumping by Light
Liang Li1,2 and Tianyu Liu1,2,*
1 Department of Physics and Center for Joint Quantum Studies, School of Science, Tianjin University, Tianjin 300350, China
2 Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Tianjin 300350, China
* tianyu_liu@tju.edu.cn
Abstract
Coherent pumping of magnons by light in an optomagnonic cavity has been recently reported. Here we propose and model the Bose-Einstein condensation of magnons pumped by a coherent pumping source in an optical cavity composed of a ferromagnetic waveguide. To stabilize the condensation, a large number of ±k-magnon pairs should be pumped into the cavity. We calculate and analyze the methods of direct pumping and indirect pumping by multiple confined optical modes. The results show that the condensation can be achieved only by the direct pumping with threshold powers less than 1 watt.
