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Article Dans Une Revue Science Année : 2020

Helical quantum Hall phase in graphene on SrTiO 3

Résumé

The ground state of charge neutral graphene under perpendicular magnetic field was predicted to be a quantum Hall topological insulator with a ferromagnetic order and spin-filtered, helical edge channels. In most experiments, however, an otherwise insulating state is observed and is accounted for by lattice-scale interactions that promote a broken-symmetry state with gapped bulk and edge excitations. We tuned the ground state of the graphene zeroth Landau level to the topological phase via a suitable screening of the Coulomb interaction with a SrTiO3 high-k dielectric substrate. We observed robust helical edge transport emerging at a magnetic field as low as 1 tesla and withstanding temperatures up to 110 kelvins over micron-long distances. This new and versatile graphene platform opens new avenues for spintronics and topological quantum computation.
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Dates et versions

hal-02546701 , version 1 (18-04-2020)

Identifiants

Citer

Louis Veyrat, Corentin Déprez, Alexis Coissard, Xiaoxi Li, Frédéric Gay, et al.. Helical quantum Hall phase in graphene on SrTiO 3. Science, 2020, 367 (6479), pp.781-786. ⟨10.1126/science.aax8201⟩. ⟨hal-02546701⟩
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