SEMINAR 2025
Optomechanical Time Crystal
| Speaker | Yingdan Wang, Institute of Theoretical Physics, Chinese Academy of Sciences, China |
| Date/Time | Friday, 7 Feb, 12nn |
| Location | S11-02-07 |
| Moderator | Prof Gong Jiangbin |
Abstract
The spontaneous breaking of time translation symmetry in periodically driven Floquet systems can lead to a discrete time crystal. We study the occurrence of such dynamical phase in a driven-dissipative optomechanical system with two membranes in the middle. We find that, under certain conditions, the system can be mapped to an open Dicke model and realizes a superradiant-type phase transition. Furthermore, applying a suitable periodically modulated drive, the system dynamics exhibits a robust subharmonic oscillation persistent in the thermodynamic limit.
Biography
Prof. Yingdan Wang obtained her PhD in Physics in 2006 from the Chinese Academy of Sciences. She then pursued her career as a postdoctoral researcher or research scientist at RIKEN (Japan), McGill University (Canada), Basel University (Switzerland), and NTT BRL (Japan). In 2014, she was recruited through the Chinese Talent Program and began working as an Associate Professor at the Institute of Theoretical Physics, Chinese Academy of Sciences. In 2017, she was promoted to Full Professor at the same institute. Her research interests include solid-state quantum state engineering, quantum optomechanics, and phase transitions in quantum open systems.