时间：2021年8月10日（周二）上午10:00-11:30

Time：10:00-11:30, Tuesday, August 10^th, 2021

地点：西湖大学云栖校区4号楼211教室

Venue: Room 211, Building 4, Yunqi Campus, Westlake University

主持人：西湖大学理学院 吴从军 讲席教授

Host: Congjun Wu, Chair Professor, School of Science, Westlake University

主讲嘉宾/Speaker：

徐海潭 副教授

南方科技大学

主讲人简介/Biography:

Haitan Xu received his B.Sc. and M.Sc. degrees from Zhejiang University in 2007 and 2009, and Ph.D. degree from University of Maryland-College Park in 2014. Then he did a postdoc at Yale University and Harvard University. In 2018 he joined Peking University as an assistant professor, and in 2020 joined Southern University of Science and Technology as an associate professor. He is both an experimentalist and a theorist, with research experience in multiple fields including optomechanics, topological physics, and quantum computation, and has published high-quality research articles in top scientific journals such as Nature, Nature Physics, Nature Communications and Physical Review Letters. His representative achievements include: Experimental realization of topological energy transfer, nonreciprocal phonon transfer, and optomechanical buckling phase transitions for the first time; Designs and algorithms for constructing universal topological quantum gates with anyons.

讲座摘要/Abstract:

Non-Hermitian systems exhibit rich physical phenomena that open the door to qualitatively new forms of control. Here I will introduce our recent works on topological and nonreciprocal dynamics in non-Hermitian optomechanical systems. Specifically, we realized topological energy transfer by adiabatically encircling an exceptional point. We also demonstrated that this energy transfer is non-reciprocal: a certain topological operation can only transfer energy in one direction. Furthermore, we realized stable nonreciprocal coupling between phonon modes with optomechanical interference. We achieved phonon isolation which can be tuned continuously over a wide range from -30dB to 30dB. We showed the nonreciprocal phonon transfer as a new way to control the thermal fluctuation of phonon modes by controlling laser phases.

讲座联系人/Contact:

理学院 张老师 zhangyue62@westlake.edu.cn