Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 13: Magnonics 1
MA 13.12: Talk
Tuesday, September 6, 2022, 12:15–12:30, H43
Beating Fabry-Pérot interference pattern in a magnonic scattering junction in the graphene quantum Hall ferromagnet — •Jonathan Atteia1,2, François Parmentier3, Preden Roulleau3, and Mark-Oliver Goerbig2 — 1Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany — 2Laboratoire de Physique des Solides, Université Paris Saclay, CNRS UMR 8502, F-91405 Orsay Cedex, France — 3SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, F-91191 Gif sur Yvette Cedex, France
At filling factor ν=0,±1, the ground state of graphene is a particular SU(4) ferromagnet which hosts a rich phase diagram along with several spin, pseudospin or “entanglement” magnon modes. Motivated by recent experiments, we study a ν=−1|0|−1 Fabry-Pérot magnonic junction. If the ground state at ν=0 is spin polarized, there exist two spin modes which interfere and create a beating pattern, while pseudospin modes are reflected. The same scenario occurs for pseudospin magnon if the ν=0 ground state is pseudospin polarized. The observation of such an interference pattern would provide information on the low-energy anisotropies and thus on the ground state.