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MA: Fachverband Magnetismus

MA 13: Magnonics 1

MA 13.12: Vortrag

Dienstag, 6. September 2022, 12:15–12:30, H43

Beating Fabry-Pérot interference pattern in a magnonic scattering junction in the graphene quantum Hall ferromagnet — •Jonathan Atteia^1,2, 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.