Strong Coupling of Microwave Photons to Antiferromagnetic Fluctuations in an Organic Magnet

ORAL

Abstract

We present experiments on the coupling between a crystal of di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium radicals and a superconducting microwave resonator in a circuit quantum electrodynamics (circuit QED) architecture [1]. 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.

[1] Mergenthaler, M. et al., Phys. Rev. Lett. 119, 147701 (2017).

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Presenters

  • Matthias Mergenthaler

    Department of Materials, University of Oxford

Authors

  • Matthias Mergenthaler

    Department of Materials, University of Oxford

  • Junjie Liu

    Department of Materials, University of Oxford, Physics, Univ of Oxford

  • Jennifer Le Roy

    Department of Materials, University of Oxford

  • Natalia Ares

    Department of Materials, University of Oxford

  • Amber Thompson

    Chemistry Research Laboratory, University of Oxford, Department of Chemistry, University of Oxford

  • Lapo Bogani

    Department of Materials, University of Oxford

  • Fernando Luis

    Instituto de Ciencia de Materiales de Aragón, CSIC-U. de Zaragoza

  • Stephen Blundell

    Clarendon Laboratory, Department of Physics, University of Oxford

  • Tom Lancaster

    Department of Physics, Durham University

  • Arzhang Ardavan

    Clarendon Laboratory, Department of Physics, University of Oxford, Department of Physics, University of Oxford

  • Andrew Briggs

    Department of Materials, University of Oxford, Materials Department, University of Oxford

  • Peter Leek

    Physics, University of Oxford, Clarendon Laboratory, Department of Physics, University of Oxford, Condensed Matter Physics, University of Oxford, Clarendon Laboratory, University of Oxford

  • Edward Laird

    Department of Materials, University of Oxford