2019/07/07 by Fangxing Zhang, Yaming Feng, Xianfeng Chen +2
Physics and Astronomy · #Brillouin scattering #Brillouin zone #Hermitian matrix #Mechanical and Optical Resonators #Nonlinear Photonic Systems #Optical fiber #Optics #Parity (physics) #Photonics #Physics #Quantum Mechanics and Non-Hermitian Physics #Quantum mechanics #Quantum optics #Scattering #Symmetry (geometry) #physics.optics
paper · pdf · doi:10.1103/physrevlett.124.053901
published as Phys. Rev. Lett. 124, 053901 (2020) · 11 pages, 3 figures
arxiv created 2019/07/07 · openalex publication_date 2020/02/03 · arxiv updated 2020/02/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Non-Hermitian systems based on parity-time (PT) and anti-PT symmetry reveal rich physics beyond the Hermitian regime. So far, realizations of such symmetric systems have been limited to the spatial domain. Here we theoretically and experimentally demonstrate synthetic anti-PT symmetry in a spectral dimension induced by nonlinear Brillouin scattering in a single optical microcavity, where Brillouin scattering induced transparency or absorption in two spectral resonances provides the optical gain and loss to observe a phase transition between two symmetry regimes. This scheme provides a new paradigm towards the investigation of non-Hermitian physics in a synthetic photonic dimension for all-optical signal processing and quantum information science.