报告题目 :Bose-Einstein condensation of magnons under coherent pumping by light
报告人: 柳天宇 副教授 (天津大学)
报告时间:2024年4月26日(星期五)14:00-15:00
报告地点:北洋园校区 49 教 410 室 (线上:腾讯会议 838-9499-4192)
报告摘要:
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.
报告人简介:
2002-2008年在天津大学先后取得应用物理学学士和凝聚态物理学硕士。2013年在美国密苏里大学哥伦比亚分校取得物理学博士,师从Prof. Giovanni Vignale。随后,前往美国爱荷华大学从事博士后的工作,合作导师Prof. Michael E. Flatté。2016年,入职天津大学理学院担任特聘研究员、副教授。荣获天津市青年人才计划和“北洋青年学者”。主要研究方向:自旋波自旋电子学、非线性光学、等离激元学。
参考文献:
[1] Šimić, F., Sharma, S., Blanter, Y. M. & Bauer, G. E. W. Coherent pumping of high-momentum magnons by light. Phys. Rev. B 101, 100401 (2020).
[2] Zhu, N., Zhang, X., Han, X., Zou, C.-L. & Tang, H. X. Inverse Faraday Effect in an Optomagnonic Waveguide. Phys. Rev. Applied 18, 024046 (2022).
[3] Dzyapko, O. et al. Magnon-magnon interactions in a room-temperature magnonic Bose-Einstein condensate. Phys. Rev. B 96, 064438 (2017).