报告题目：Skyrmions in Helimagnets

报 告 人：臧佳栋 教授（University of New Hampshire）

主 办：物理工程学院、激光研究所

时 间：2017年5月31日(周三) 下午15:00

地 点：物理楼313报告厅

臧佳栋教授简历：

臧佳栋，1984年出生于浙江宁波。2007年获复旦大学学士学位，2012年获复旦大学博士学位，毕业后到美国霍普金斯大学做博士后研究，并于2015年起在美国University of New Hampshire 大学物理系和材料物理系担任助理教授，同时担任美国加州大学河边分校电机系和中国科学院强磁场实验中心客座教授。长期从事凝聚态理论研究，重点研究低维磁性材料和拓扑物态的研究，主持美国能源部和科学基金委多项课题。发表论文30余篇，引用1600余次，其中包括Nature Materials, Nature Communications, Phys. Rev. Lett.等多篇有影响力文章。受邀为Science, Nature, Physical Reviews 等国际期刊的论文审稿人。

报告摘要：

A Skyrmion is a topological configuration in which local spins wrap around the unit sphere for an integer number of times. After decades of theoretical discussions in high energy physics, it has been recently observed in a series of non-centrosymmetric chiral magnets. Several experiments by neutron scattering or transmission electron microscopy confirm the presence of skyrmions in a crystalline state at a finite window of magnetic field and temperature. Skyrmions show various novel properties inherent to its topological nature, such as topological Hall effect, topological stability, and ultralow critical current for movement, which offer the skyrmion promising prospects for next generation spintronic devices and information storage. In this talk, I will explain the physical origin of skyrmions in chiral magnets and its unique topological dynamics related to the emergent electromagnetism. I will then focus on our recent works on discovering new skyrmion materials, skyrmion in confined geometries, and electron transports of the skyrmion materials.