Non-Hermitian systems possess many novel properties that differ from Hermitian systems. For example, parity-time (PT) symmetric properties, PT phase transitions, exceptional points, and non-Hermitian skin effects. These rich physical phenomena not only help us further develop the basic theory of quantum mechanics, but also have broad application prospects in improving precision measurement sensitivity and designing new photonics devices. We have conducted research on non-Hermitian physics based on thermal atomic ensembles. By manipulating dissipation and interaction, we regulate their non-Hermitian characteristics, obtain exceptional points, construct PT-symmetric systems, and further apply them to fields such as precision measurement of magnetic fields.
Yong-Chun Liu is an Associate Professor in the Department of Physics at Tsinghua University. He holds a Ph.D. from the School of Physics at Peking University and has conducted visiting studies in the Department of Mechanical Engineering at Columbia University. In 2015, he joined the Qian Xuesen Laboratory of Space Technology at the China Academy of Space Technology (CAST) as an Associate Professor, before moving to Tsinghua University in 2017. He has published over 80 papers (including 10 in PRL as the first/corresponding author) in the field of quantum optics, quantum precision measurement, non-Hermitian physics, etc.
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai