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The ground state of charge neutral graphene under perpendicular magneticfield was predicted to be a quantum Hall topological insulator with aferromagnetic order and spin-filtered, helical edge channels. In mostexperiments, however, an otherwise insulating state is observed and isaccounted for by lattice-scale interactions that promote a broken-symmetrystate with gapped bulk and edge excitations. We tuned the ground state of thegraphene zeroth Landau level to the topological phase via a suitable screeningof the Coulomb interaction with a SrTiO$_3$ high-$k$ dielectric substrate. Weobserved robust helical edge transport emerging at a magnetic field as low as 1tesla and withstanding temperatures up to 110 kelvins over micron-longdistances. This new and versatile graphene platform opens new avenues forspintronics and topological quantum computation.

Helical quantum Hall phase in graphene on SrTiO$_3$