1. Breaking Anti-PT Symmetry by Spinning a Resonator
- Author
-
Cheng-Wei Qiu, Ran Huang, Ying Li, Huilai Zhang, Hui Jing, Sheng-Dian Zhang, and Franco Nori
- Subjects
Physics ,business.industry ,Antisymmetric relation ,Mechanical Engineering ,Bioengineering ,Gyroscope ,General Chemistry ,Condensed Matter Physics ,Symmetry (physics) ,law.invention ,Resonator ,law ,Quantum mechanics ,General Materials Science ,Photonics ,business ,Spinning ,Lasing threshold ,Optomechanics - Abstract
Non-Hermitian systems, with symmetric or antisymmetric Hamiltonians under the parity-time (PT) operations, can have entirely real or imaginary eigenvalues. This fact has led to surprising discoveries such as loss-induced lasing and topological energy transfer. A merit of anti-PT systems is free of gain, but in recent efforts on making anti-PT devices, nonlinearity is still required. Here, counterintuitively, we show how to achieve anti-PT symmetry and its spontaneous breaking in a linear device by spinning a lossy resonator. Compared with a Hermitian spinning device, significantly enhanced optical isolation and ultrasensitive nanoparticle sensing are achievable in the anti-PT-broken phase. In a broader view, our work provides a new tool to study anti-PT physics, with such a wide range of applications as anti-PT lasers, anti-PT gyroscopes, and anti-PT topological photonics or optomechanics.
- Published
- 2020