时 间：2023年04月26日（星期三）上午10:00
地 点：新楼三层第三会议室
题 目：Novel nonrelativistic and nonmagnetic control of terahertz charge currents via electrical anisotropy in conductive materials
报告人：陶镇生 教授 ，复旦大学
主持人：戴庆 研究员
报告人简介：
陶镇生教授，2005年和2008年获得复旦大学物理学系学士和硕士学位，2014年在美国密歇根州立大学物理天文系获得博士学位。2014-2018年在美国JILA，科罗拉多博德分校，Kapteyn-Murnane组任博士后助理研究员，2018年至今在复旦大学物理学系任研究员，博士生导师。长期从事超快光物理研究和超快光学技术发展，探索覆盖太赫兹到软X射线波段光与物质相互作用下的超快非平衡态物理过程。曾经获得德国洪堡学者、国家引才计划青年项目和上海市“东方学者”特聘教授等奖项。
报告摘要：
Precise and ultrafast control over photo-induced charge currents across nanoscale interfaces could lead to important applications in energy harvesting, ultrafast electronics, and coherent terahertz sources. In this talk, I will introduce recent developments in terahertz emitters based on spintronic devices utilizing several relativistic mechanisms, including inverse spin-Hall effect, inverse Rashba-Edelstein effect and inverse spin-orbit-torque effect. I will also present a novel nonrelativistic and nonmagnetic mechanism that directly utilizes the photo-excited high-density charge currents across the interface. We demonstrate that the electrical anisotropy of conductive materials can effectively deflect injected charge currents to the transverse direction, resulting in efficient and broadband terahertz radiation. Importantly, this new mechanism has the potential to offer an order of magnitude higher conversion efficiency compared to previous methods. Our new findings offer exciting possibilities for directly utilizing these photo-excited high-density currents across metallic interfaces for ultrafast electronics and terahertz spectroscopy.
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