哈尔滨工业大学（深圳）学术讲座

演讲人Speaker：Chen Hu(胡晨),香港中文大学物理系

题目Title: Diverse Moiré Exciton Physics in 2D Superlattices

时间Date：2026 年5月7日      Time：3:00-4:00

地点Venue： G栋 514室

内容摘要Abstract：

Moiré superlattices, created by combining low-dimensional materials with small lattice mismatches or different orientations, offer a powerful platform for exploring fascinating physical phenomena. Recent advances in optical spectroscopies have revealed rich experimental signatures of novel moiré exciton states in 2D superlattices; however, the microscopic nature of these states and strategies for their effective manipulation remain to be fully explored. In this talk, I will introduce our recent discoveries in 2D moiré-induced exciton physics. First, I will demonstrate that moiré excitonic effects can greatly enhance nonlinear optical responses, leading to the striking formation of light-induced nonlinear photocurrent vortex crystals and associated magnetic fields. This provides a promising all-optical control route to manipulate such exotic photoexcited moiré quantum matter. Second, I will show that the moiré potential can be continuously and efficiently tuned via pressure engineering, driving exciton physics from the weak- to the strong-moiré regime. In this process, we identify a previously underexplored moiré exciton state arising from the coupling between intrinsic excitonic Coulomb attraction and external moiré confinement. Our results highlight the rich photophysics of 2D moiré superlattices and open new opportunities for applications in moiré-based optoelectronics and photovoltaics.

个人简介(About the speaker):

Chen Hu (胡晨) is an Assistant Professor in the Department of Physics at the Chinese University of Hong Kong. He was a postdoctoral research fellow at the University of California, Berkeley, and the Lawrence Berkeley National Laboratory from 2021 to 2024. He earned his PhD in physics from McGill University in Canada in 2020. His research engages in the fields of theoretical condensed matter physics and computational material science. He focuses on intriguing photoexcited phenomena, moiré physics, ultrafast and nonlinear optoelectronics, topological matter, quantum transport and spintronics in emerging low-dimensional quantum materials and nanodevices.