报告人：刘亮，副教授 (上海交通大学)

时 间：2023年3月23号（周四）上午10:00-11:00

地 点：良乡校区理学楼B203

摘要：

自旋电子学的基本内容是通过调控电子的自旋角动量，实现自旋信息的存储、传输和处理。作为自旋电子学中最前沿的技术之一，电流诱导的自旋轨道矩可以高效地驱动磁矩翻转，从而有望被用于新一代磁性随机存储器。近期，我们研究了外延金属薄膜体系中的自旋轨道矩现象，利用新的非对称模式（晶格低对称性、元素组分梯度），实现面外自旋轨道矩[1]和体自旋轨道矩[2]，在单层铁磁金属薄膜中实现了零磁场下电流驱动的垂直磁矩翻转[3]。本报告将从对称性分析的角度讲述如何设计自旋轨道矩及其在信息存储领域的应用，也将讨论利用氧化物异质结[4,5]和拓扑半金属材料[6]开发自旋电子器件的思路。

[1] Liu et al. Nature Nanotechnology 16, 277-282 (2021)

[2] Liu et al. Physical Review B 101, 220402(R) (2020)

[3] Liu et al. Nature Communications 13, 3539 (2022)

[4] Liu et al. Nature Nanotechnology 14, 939–944 (2019)

[5] Liu et al. Physical Review B 105, 144419 (2022)

[6] Lin et al. Advanced Materials 33, 2101316 (2021)

简历：

刘亮，2011年毕业于华中科技大学7003全讯入口，获理学学士学位。2016年毕业于北京大学7003全讯入口，获理学博士学位。2016年至2022年在新加坡国立大学从事博士后和资深博士后研究工作。2022年9月加入上海交通大学物理与天文学院任长聘教轨副教授，博士生导师。目前的研究兴趣包括：自旋电子学及其在信息存储领域的应用 (外延磁性薄膜生长、微纳器件加工)，拓扑超导量子计算（马约拉纳零能模相关的器件），拓扑量子材料的电荷与自旋输运（极低温、强磁场下的小信号测量等），电子器件的噪声（1/f 噪声、散粒噪声）。

联系方式：tsingson@bit.edu.cn

邀请人：王钦生

网 址：/

承办单位：物理学院、先进光电量子结构设计与测量教育部重点实验室

*Reporter：Liang Liu, Shanghai Jiao Tong University

*Time：March 23rd 2023, 10:00-11:00

*Place：Physics Building B 203

*Contact Person: Qinsheng Wang

*Abstract:

The basic content of spintronics is to store, transmit and process spin information by controlling the spin angular momentum of electrons. As one of the most advanced technologies in spintronics, the current-induced spin-orbit torque can efficiently drive magnetization switching, and is expected to be used in the next generation of magnetic random access memory. Recently, we studied the spin-orbit torque in epitaxial metal thin film systems, and achieved out-of-plane spin-orbit torque [1] and bulk spin-orbit torque [2] by breaking more symmetries (low crystal symmetry and composition gradient), and realized the current-induced perpendicular magnetization switching at zero magnetic field in a single-layer ferromagnetic metal film [3]. This report will discuss how to design the spin-orbit torque and its application in the field of information storage from the perspective of symmetry analysis, and also explore the development of spintronics devices using oxide heterostructures [4,5] and topological semimetals [6].

*Profile：

Liu Liang received his Bachelor's degree from the School of Physics at Huazhong University of Science and Technology in 2011, and his Ph.D. degree from the School of Physics at Peking University in 2016. He worked as a postdoctoral researcher and senior postdoctoral researcher at the National University of Singapore from 2016 to 2022. In September 2022, he joined the School of Physics and Astronomy at Shanghai Jiao Tong University as a tenure-track associate professor and Ph.D. supervisor. His current research interests include spintronics and its applications in the field of information storage (epitaxial magnetic thin film growth, micro-nanodevice fabrication), topological superconducting quantum computing (devices related to Majorana zero modes), charge and spin transport in topological quantum materials (small signal measurements at extremely low temperatures and strong magnetic fields), and noise in electronic devices (1/f noise, shot noise).