Observation of the Magnonic Dicke Superradiant Phase Transition

• URL: http://arxiv.org/abs/2401.01873v1
• Date: Wed, 3 Jan 2024 18:31:50 GMT
• Title: Observation of the Magnonic Dicke Superradiant Phase Transition
• Authors: Dasom Kim, Sohail Dasgupta, Xiaoxuan Ma, Joong-Mok Park, Hao-Tian Wei, Liang Luo, Jacques Doumani, Xinwei Li, Wanting Yang, Di Cheng, Richard H. J. Kim, Henry O. Everitt, Shojiro Kimura, Hiroyuki Nojiri, Jigang Wang, Shixun Cao, Motoaki Bamba, Kaden R. A. Hazzard, Junichiro Kono
• Abstract summary: Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the superradiant phase transition. The absence of the diamagnetic term in the Fe$3+$-Er$3+$ exchange coupling ensures that the no-go theorem does not apply.
• Score: 3.5671029731236614
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Two-level atoms coupled with single-mode cavity photons are predicted to exhibit a quantum phase transition when the coupling strength exceeds a critical value, entering a phase in which atomic polarization and photonic field are finite even at zero temperature and without external driving. However, this phenomenon, the superradiant phase transition (SRPT), is forbidden by a no-go theorem due to the existence of the diamagnetic term in the Hamiltonian. Here, we present spectroscopic evidence for a magnonic SRPT in ErFeO$_3$, where the role of the photonic mode (two-level atoms) in the photonic SRPT is played by an Fe$^{3+}$ magnon mode (Er$^{3+}$ spins). The absence of the diamagnetic term in the Fe$^{3+}$-Er$^{3+}$ exchange coupling ensures that the no-go theorem does not apply. Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the SRPT -- a kink and a softening, respectively, of two spin-magnon hybridized modes at the critical point.

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