Observation of the Magnonic Dicke Superradiant Phase Transition - INSPIRE

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Observation of the Magnonic Dicke Superradiant Phase Transition

Jan 3, 2024

e-Print:

2401.01873 [quant-ph]

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Abstract: (arXiv)

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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