新闻动态
综合新闻
科研动态
学术活动
媒体聚焦
通知公告
您现在的位置:首页 > 新闻动态 > 学术活动
8.10】报告人:程然
题目:Electron Dynamics in...
 
2012-08-06 | 文章来源:磁性材料与磁学研究部        【 】【打印】【关闭

题 目:Electron Dynamics in Slowly Varying Anti-ferromagnetic texture -- Emergent non-Abelian Electromagnetism

报告人:程然

工作单位: 美国德克萨斯大学奥斯汀分校物理系

时 间:8月10日(周五)15:30-17:00

地 点:李薰楼468会议室

欢迎参加! 

 

报告摘要:

Effective dynamics of conduction electrons in anti-ferromagnetic (AFM) materials with slowly varying spin texture is developed via non-Abelian gauge theory. Quite different from the ferromagnetic (FM) case, the spin of a conduction electron does not follow the background texture even in the adiabatic limit due to the accumulation of a SU(2) non-Abelian Berry phase. Correspondingly, it is found that the orbital dynamics becomes spin dependent and is affected by two emergent gauge fields. While one of them is the non-Abelian generalization of what has been discovered in FM systems, the other leads to an anomalous velocity that has no FM counterpart. An example of FM/AFM/FM tri-layer structure with experimental predictions is provided.

References:

[1] Electron dynamics in slowly varying anti-ferromagnetic texture, Ran Cheng and Qian Niu, arXiv:1201.3523

 

报告人介绍:

Education:

♦ University of Texas at Austin 09. 2008 – Present

  Department of Physics, PhD candidate, Condensed Matter Theory

♦ Huazhong University of Science and Technology 09. 2004 – 06. 2008

  Department of Physics, Bachelor of Science, GPA: 90.0/100.0

  Thesis: Study of Quantum Adiabatic Theory and Geometric Phases in a Model

Current Research:

♦ Anti-ferromagnetic Spintronics

   1. Electron dynamics and emergent gauge structures in smooth anti-ferromagnetic Texture

   2. Spin transfer torque and spin dynamics in anti-ferromagnetic metals

   3. Domain Wall dynamics and magneto-resistance

♦ Vortex dynamics in two-dimensional quantum fluid

   1. Berry phase theory of quantized Magnus force

   2. Vortex interaction due to the compressibility of quantum fluid

文档附件

相关信息
联系我们 | 所长信箱 | 网站地图 | 友情链接
地址: 沈阳市沈河区文化路72号 邮编: 110016
管理员邮箱: office@imr.ac.cn
中国科学院金属研究所 版权所有 辽ICP备05005387号

官方微博

官方微信