题目：Exciton-driven Magnetic Photogalvanic Effects in A PT-symmetric 2D Magnet
时间：2026年6月26日 14:00-15:30
地点：威尼斯9499登录入口 F310会议室
邀请人：沈道智 副教授（智能制造与信息工程研究所）
Biography
Adam W. Tsen now is an associate professor of the University of Waterloo's Department of Chemistry and the Institute for Quantum Computing. His research focuses on the study of low-dimensional materials that exhibit exotic quantum phenomena, and their integration into novel electronic devices. After receiving a BS in Electrical Engineering and Computer Sciences, as well as a BS in Engineering Physics at the University of California, Berkeley, he completed his PhD in Applied Physics at Cornell University under the guidance of Jiwoong Park. Tsen then joined the Department of Physics at Columbia University as a postdoctoral associate with Abhay Pasupathy and Philip Kim, where he studied atomically thin quantum materials and incorporated them in nanoscale electronic devices. In 2016, he joined the University of Waterloo's Department of Chemistry and the Institute for Quantum Computing. He is continuing to explore these materials and develop novel quantum devices based on their exotic properties.
Abstract
This work discusses recent experiments observing photogalvanic effects (or nonlinear photocurrents) from strongly bound exciton states in a 2D magnetic system, whereby inversion symmetry is established or broken by the spin degree of freedom. Here, both magnetic and electric fields can be used to control the photogalvanic effect and isolate it from linear photocurrents. The devices act as tunable helicity- and polarization-sensitive detectors with the capability to transduce deep sub-gap signals.
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