Quantum Simulation of an Extended Dicke Model with a Magnetic Solid
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 phases. Here, we simulate such an extended Dicke model using a crystal of ErFeO, where the role of atoms (photons) is played by Er spins (Fe magnons). Through magnetocaloric effect and terahertz magnetospectroscopy measurements, 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 condensed matter systems.
Cite
@article{arxiv.2302.06028,
title = {Quantum Simulation of an Extended Dicke Model with a Magnetic Solid},
author = {Nicolas Marquez Peraca and Xinwei Li and Jaime M. Moya and Kenji Hayashida and Dasom Kim and Xiaoxuan Ma and Kelly J. Neubauer and Diego Fallas Padilla and Chien-Lung Huang and Pengcheng Dai and Andriy H. Nevidomskyy and Han Pu and Emilia Morosan and Shixun Cao and Motoaki Bamba and Junichiro Kono},
journal= {arXiv preprint arXiv:2302.06028},
year = {2025}
}