Magnetically tuned continuous transition from weak to strong coupling in terahertz magnon polaritons
Andrey Baydin, Kenji Hayashida, Takuma Makihara, Fuyang Tay, Xiaoxuan Ma, Wei Ren, Guohong Ma, G. Timothy Noe, Ikufumi Katayama, Jun Takeda, Hiroyuki Nojiri, Shixun Cao, Motoaki Bamba, Junichiro Kono
Abstract
Highly tunable light-matter hybrids, magnon polaritons, have been realized in an orthoferrite crystal driven by terahertz radiation in an external magnetic field. As the magnetic field is swept, a continuous transition from weak to strong coupling via an exceptional point due to a magnetic-field-dependent light-matter coupling strength is observed.
Topics & Concepts
OrthoferriteMagnonPolaritonCondensed matter physicsTerahertz radiationMagnetic fieldPhysicsCoupling (piping)Materials scienceOpticsFerromagnetismMagnetizationQuantum mechanicsMetallurgyMechanical and Optical ResonatorsStrong Light-Matter InteractionsTopological Materials and Phenomena