title: PT-Symmetry-Breaking Chaos in Optomechanics.
abstract: We demonstrate PT-symmetry-breaking chaos in an optomechanical system, which features an ultralow driving threshold. In principle, this chaos will emerge once a driving laser is applied to the cavity mode and lasts for a period of time. The driving strength is inversely proportional to the starting time of chaos. This originally comes from the dynamical enhancement of nonlinearity by field localization in the PT-symmetry-breaking phase. Moreover, this chaos is switchable by tuning the system parameters so that a PT-symmetry phase transition occurs. This work may fundamentally broaden the regimes of cavity optomechanics and nonlinear optics. It offers the prospect of exploring ultralow-power-laser-triggered chaos and its potential applications in secret communication.
authors.affiliation: Wuhan National Laboratory for Optoelectronics and School of physics, Huazhong University of Science and Technology, Wuhan 430074, Peoples Republic of China.
authors.forename: Xin-You
authors.initials: XY
authors.lastname: Lü
authors.affiliation: Department of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Jing
authors.affiliation: Wuhan National Laboratory for Optoelectronics and School of physics, Huazhong University of Science and Technology, Wuhan 430074, Peoples Republic of China.
authors.forename: Jin-Yong
authors.initials: JY
authors.lastname: Ma
authors.affiliation: Wuhan National Laboratory for Optoelectronics and School of physics, Huazhong University of Science and Technology, Wuhan 430074, Peoples Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu