Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet

Abstract

Coupling between a crystal of di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium radicals and a superconducting microwave resonator is investigated in a circuit quantum electrodynamics (circuit QED) architecture. The crystal exhibits paramagnetic behavior above 4~K, with antiferromagnetic correlations appearing below this temperature, and we demonstrate strong coupling at base temperature. The magnetic resonance acquires a field angle dependence as the crystal is cooled down, indicating anisotropy of the exchange interactions. These results show that multispin modes in organic crystals are suitable for circuit QED, offering a platform for their coherent manipulation. They also utilize the circuit QED architecture as a way to probe spin correlations at low temperature.

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• Photon Condensation and Enhanced Magnetism in Cavity QED
• Generalized Ramsey Interferometry Explored with a Single Nuclear Spin Qudit
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• Magnon-photon coupling in a non-collinear magnetic insulator Cu${}_2$OSeO${}_3$
• Dispersive readout of molecular spin qudits
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• Linear response theory for cavity QED materials at arbitrary light-matter coupling strengths
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• Hybrid Atomistic-Parametric Decoherence Model for Molecular Spin Qubits
• Waveguide quantum electrodynamics at the onset of spin-spin correlations