Topological optomechanical amplifier in synthetic PT
$\mathcal{PT}$
-symmetry
Zhang Jian-Qi,
Liu Jing-Xin,
Zhang Hui-Lai,
Gong Zhi-Rui,
Zhang Shuo,
Yan Lei-Lei,
Su Shi-Lei,
Jing Hui,
Feng Mang
Affiliations
Zhang Jian-Qi
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan430071, China
Liu Jing-Xin
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan430071, China
Zhang Hui-Lai
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha410081, China
Gong Zhi-Rui
The College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen518060, China
Zhang Shuo
Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou, 450001, China
Yan Lei-Lei
School of Physics, Zhengzhou University, Zhengzhou450001, China
Su Shi-Lei
School of Physics, Zhengzhou University, Zhengzhou450001, China
Jing Hui
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha410081, China
Feng Mang
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan430071, China
We propose how to achieve synthetic PT $\mathcal{PT}$ symmetry in optomechanics without using any active medium. We find that harnessing the Stokes process in such a system can lead to the emergence of exceptional point (EP), i.e., the coalescing of both the eigenvalues and the eigenvectors of the system. By encircling the EP, both nonreciprocal optical amplification and chiral mode switching can be achieved. As a result, our synthetic PT $\mathcal{PT}$ -symmetric optomechanics works as a topological optomechanical amplifier. This provides a surprisingly simplified route to realize PT $\mathcal{PT}$ -symmetric optomechanics, indicating that a wide range of EP devices can be created and utilized for various applications such as topological optical engineering and nanomechanical processing or sensing.
