Visualization of Isospin Momentum Texture of Dirac Magnons and Excitons in a Honeycomb Quantum Magnet

ORAL

Abstract

Band topology in electronic systems is known to have profound consequences on various observable properties in semi-metals and certain insulators. Insights from this field have reached into many areas of physics and in this talk we describe certain universal signatures of band topology in propagating bosonic quasi-particles. We show that the Dirac magnon material CoTiO3 provides an experimental demonstration of a universal winding of the inelastic neutron scattering intensity around linear touching points of magnetic excitations - magnons and spin-orbit excitons - that originates from the isospin texture of the quasiparticle wavefunction in momentum space. https://arxiv.org/abs/2007.04199

*We acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme Grant Agreement Number 788814 (EQFT) and from the National Science Foundation under Grant No. NSF PHY-1748958. ME acknowledges support from Lincoln College and the University of Oxford and RDJ acknowledges support from a Royal Society University Research Fellowship.

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Presenters

  • Miska Elliot

    • Clarendon Laboratory, University of Oxford

Authors

  • Miska Elliot

    • Clarendon Laboratory, University of Oxford

  • Paul McClarty

    • Max Planck Institute for the Physics of Complex Systems

  • Dharmalingam Prabhakaran

    • Clarendon Laboratory, University of Oxford

  • Roger D Johnson

    • University College London
    • Department of Physics and Astronomy, University College London

  • Helen Walker

    • ISIS Pulsed Neutron and Muon Source
    • ISIS Facility, Rutherford Appleton Laboratory

  • Pascal Manuel

    • Rutherford Appleton Lab
    • Rutherford Appleton Laboratory
    • STFC, Rutherford Appleton Lab
    • ISIS, Rutherford Appleton Laboratory
    • ISIS Pulsed Neutron and Muon Facility, STFC Rutherford Appleton Laboratory
    • ISIS Facility, Rutherford Appleton Laboratory

  • Radu Coldea

    • University of Oxford
    • Clarendon Laboratory, University of Oxford
    • Clarendon Laboratory, Oxford University