【时  间】2024年8月9日（周五）上午10:00

【地  点】量子院 526会议室

【主  持】张谷 拓扑量子计算团队 助理研究员

【题  目】Non-Hermitian Perspective for Mesoscopic Physics

【摘  要】In condensed matter physics, various physical phenomena can be effectively described using Green’s functions, typically corresponding to non-Hermitian Hamiltonians. Recent advancements in non-Hermitian physics have offered a fresh perspective to condensed matter physics, leading to exploration of non-Hermitian self-energies with intricate structures. One intriguing non-Hermitian phenomenon is the non-Hermitian skin effect, characterized by the nonreciprocal propagation of wave packets within the system and the accumulation of bulk states at open boundaries. In this presentation, I will discuss the implementation and control of the non-Hermitian skin effect in mesoscopic electronic systems. Specifically, the conventional, spin-, and valley-resolved non-Hermitian skin effect can be realized through complex band engineering in mesoscopic heterostructures, resulting in nonreciprocal electron transport phenomena. This effect holds promise for the development of robust electronic devices, such as valley filters. Additionally, the application of a magnetic field can suppress the skin effect, providing an effective means for its control.

【报告人简介】Dr. Wei Chen is a professor of theoretical physics at Nanjing University. He received his Ph.D. in Theoretical Physics from Nanjing University in 2014. From 2017 to 2019, he worked as a visiting scholar at the Institute of Theoretical Physics at ETH Zurich. He was appointed as a professor at the School of Physics at Nanjing University in 2020. Wei Chen’s research field is theoretical condensed matter physics, and his recent research interest includes quantum transport and phase transition in topological matter and non-Hermitian systems.