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-P\'erot 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.
@article{arxiv.2204.12795,
title = {Beating Fabry-P\'erot interference pattern in a magnonic scattering junction in the graphene quantum Hall ferromagnet},
author = {Jonathan Atteia and Preden Roulleau and Mark O. Goerbig},
journal= {arXiv preprint arXiv:2204.12795},
year = {2024}
}