周惠久论坛——Emergent properties and functions of topological magnets

讲座名称: 周惠久论坛——Emergent properties and functions of topological magnets
讲座时间: 2018-11-19
讲座人: Yoshinori Tokura
形式:
校区: 兴庆校区
实践学分:
讲座内容: 讲座时间:2018年11月19日上午10:00-11:30 讲座地点:仲英楼 材料学院第一会议室 讲座人: Yoshinori Tokura 教授 讲座主题:Emergent properties and functions of topological magnets 讲座内容: Magnetism meets topology. The topology of spin texture either in momentum space and real space can generate emergent electromagnetic fields acting on the conduction and valence electrons in solid, produce intriguing properties and responses. One archetypical example is a magnetic skyrmion, a spin swirling object with integer winding number. Its topology protects the skyrmion from external perturbation, forming a robust metastable state. Skyrmions and accompanied magnetic monopoles provide a fertile research field not only for topology physics but also for new spintronic functions.  One other important example of topological magnets is magnetic topological insulators, in which the spin-momentum locking as well as the magnetization-induced mass-gap shows up to form the ideal 2D Weyl fermion system at surface. With control of the magnetizations on the top and bottom surfaces, quantum anomalous Hall state and quantum magnetoelectric (axion insulator) state can be formed. Therein, the topological magneto-optical effects also show up and the quantized chiral edge conduction is realized on the reconfigurable magnetic domain walls. These momentum-space or real-space topological spin textures are overviewed with perspectives of exploration for new quantum materials and functions.。
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