Quantum simulation of an extended Dicke model with a magnetic solid

作者：Nicolás Márquez Peraca, Xinwei Li, Jaime M. Moya, Kenji Hayashida, Dasom Kim, Xiaoxuan Ma, Kelly J. Neubauer, Diego Fallas Padilla, C.-L. Huang, Pengcheng Dai, Andriy H. Nevidomskyy, Han Pu, E. Morosan, Shixun Cao, Motoaki Bamba, Junichiro Kono · 发表于：Communications Materials · 年份：2024 · DOI：10.1038/s43246-024-00479-3 · 被引用次数：7 · 研究领域：Spectroscopy and Quantum Chemical Studies、Quantum optics and atomic interactions、Random lasers and scattering media

Abstract The Dicke model describes the cooperative interaction of an ensemble of two-level atoms with a single-mode photonic field and exhibits a quantum phase transition as a function of light–matter coupling strength. Extending this model by incorporating short-range atom–atom interactions makes the problem intractable but is expected to produce new physical phenomena and phases. Here, we simulate such an extended Dicke model using a crystal of ErFeO 3 , where the role of atoms (photons) is played by Er 3+ spins (Fe 3+ magnons). Through terahertz spectroscopy and magnetocaloric effect measurements as a function of temperature and magnetic field, we demonstrated the existence of a novel atomically ordered phase in addition to the superradiant and normal phases that are expected from the standard Dicke model. Further, we elucidated the nature of the phase boundaries in the temperature–magnetic-field phase diagram, identifying both first-order and second-order phase transitions. These results lay the foundation for studying multiatomic quantum optics models using well-characterized many-body solid-state systems.