Transition between canted antiferromagnetic and spin-polarized ferromagnetic quantum Hall states in graphene on a ferrimagnetic insulator
Yang Li, Mario Amado, Timo Hyart, Grzegorz P. Mazur, Vetle Kjær Risinggård, Thomas Wagner, Lauren McKenzie-Sell, G. H. Kimbell, J. Wunderlich, Jacob Linder, Jason W. A. Robinson
Abstract
Electron-electron and electron-phonon interactions break valley symmetry in graphene, favoring a $\ensuremath{\nu}$ = 0 quantum Hall state. These interactions could result in a canted antiferromagnetic state or a spin-polarized ferromagnetic state with magnetic fields of 15-30 T. By placing graphene on the ferrimagnet Y${}_{3}$Fe${}_{5}$O${}_{12}$, the authors lower the magnetic field required to modulate the magnetic state at the zeroth Landau level, and demonstrate tunability of the energy gap of the edge modes in graphene with magnetic fields above 6 T.
Topics & Concepts
Condensed matter physicsFerrimagnetismGrapheneAntiferromagnetismQuantum Hall effectFerromagnetismMagnetic fieldLandau quantizationPhysicsMaterials scienceMagnetizationQuantum mechanicsGraphene research and applicationsQuantum and electron transport phenomenaTopological Materials and Phenomena