Breaking Anti-$\mathcal{PT}$ Symmetry by Spinning a Resonator

• URL: http://arxiv.org/abs/2003.04246v2
• Date: Sun, 13 Sep 2020 09:33:56 GMT
• Title: Breaking Anti-$\mathcal{PT}$ Symmetry by Spinning a Resonator
• Authors: Huilai Zhang, Ran Huang, Sheng-Dian Zhang, Ying Li, Cheng-Wei Qiu, Franco Nori, and Hui Jing
• Abstract summary: We show how to achieve anti-$mathcalPT$ symmetry and its spontaneous breaking in a linear device by spinning a lossy resonator. Our work provides a new tool to study anti-$mathcalPT$ physics, with such a wide range of applications as anti-$mathcalPT$ lasers, anti-$mathcalPT$ gyroscopes, and anti-$mathcalPT$ topological photonics or optomechanics.
• Score: 4.12540043197439
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Hermitian systems, with symmetric or antisymmetric Hamiltonians under the parity-time ($\mathcal{PT}$) operations, can have entirely real eigenvalues. This fact has led to surprising discoveries such as loss-induced lasing and topological energy transfer. A merit of anti-$\mathcal{PT}$ systems is free of gain, but in recent efforts on making anti-$\mathcal{PT}$ devices, nonlinearity is still required. Here, counterintuitively, we show how to achieve anti-$\mathcal{PT}$ 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-$\mathcal{PT}$-broken phase. In a broader view, our work provides a new tool to study anti-$\mathcal{PT}$ physics, with such a wide range of applications as anti-$\mathcal{PT}$ lasers, anti-$\mathcal{PT}$ gyroscopes, and anti-$\mathcal{PT}$ topological photonics or optomechanics.

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