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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

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