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).

*We acknowledge support from EPSRC (EP/J015067/1 and EP/J001821/1), Marie Curie (CIG, IEF, and IIF), the ERC (338258 “OptoQMol”), Grant No. MAT2015-68204-R from Spanish MINECO, a Glasstone Fellowship, the Royal Society, the Royal Academy of Engineering, and Templeton World Charity Foundation. MM acknowled

–

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