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量子材料
Hydrodynamics of topological spin textures and their applications
作者:Shu Zhang浏览次数:
主讲人: Shu Zhang
地点: Room W563, Physics building, Peking University
时间: 4:00pm, Oct.14, 2020 (Wednesday)
主持 联系人: RYUICHI SHINDO<rshindou@pku.edu.cn>
主讲人简介: Shu Zhang received her Bachelor's degree from Tsinghua University, Beijing, China in 2014. She got her Ph.D. degree of physics at Johns Hopkins University, where she worked with Prof. Oleg Tchernyshyov, focusing on quantum spin liquids and dynamics of topological defects. She was a graduate fellow at the Kavli Institute for Theoretical Physics at University of California, Santa Barbara in 2019. She joined University of California at Los Angeles as a postdoc since Sept. 2019 to work with
Prof. Yaroslav Tserkovnyak. Recently she is working on hydrodynamics of topological spin textures and quantum sensing of spin noise.

Abstract:

Topological spin textures, such as domain walls in one dimension, vortices in two dimensions and magnetic hedgehogs in three dimensions, are promising candidates for nonlocal transport due to their stability against local fluctuations. They follow general topological conservation laws, based on which hydrodynamic theories can be formulated. In this talk, I will introduce the physical principles to drive, transport, and detect topological spin textures, and explain them with experimentally viable proposals. In particular, I will talk about a promising all-spin hardware implementation of neuromorphic computing utilizing domain walls in quasi-one-dimensional antiferromagnets; an energy-storage proposal based on free energy stored in winding textures, which can be controlled via the vorticity flow; and a scheme for three-dimensional nonlocal transport of magnetic hedgehogs. If time permits, I will briefly discuss an electrodynamic view of the XY and Heisenberg ferromagnets.