Nonlinear Dynamics in Co-magnetometers

报告摘要：Nuclear spins of noble atoms, such as He and Xe, enjoy long coherence time. They are ideal physical systems realizing high precision magnetometers which are vital for experiments in search of beyond standard model physics. Multi-magnetometers are employed to locally suppress bias field drift and even form a global network aimed to measure phenomena of large spatial scale. We study a new set-up of co-magnetometers composed of two identical magnetometers placed in dual bias magnetic fields; the two magnetometers are coupled together via a feedback magnetic field.
We find the system exhibits rich nonlinear dynamics, including limit cycles, quasi-periodic orbits and chaos. We discuss potential applications of the phenomena in precision measurement.
报告人简介：俞振华教授，本科毕业于复旦大学，博士毕业于伊利诺伊大学香槟分校，此后相继赴玻尔研究所、俄亥俄州立大学从事博士后研究，2012年任职清华大学高等研究院副研究员，2016年任职中山大学教授。俞振华主要从事冷原子物理的理论研究，并探索冷原子体系在精密测量等方面的应用，2021年7月起至今担任学院副院长，分管学院本科生教育、物理学学科规划和建设工作。其研究获得国家基金委优秀青年基金项目的资助。