DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

Parts | Days | Selection | Search | Updates | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 80: Quantum transport and quantum Hall effects

HL 80.4: Talk

Friday, March 20, 2020, 10:15–10:30, POT 51

Helical quantum Hall phase in graphene on SrTiO3 — •Louis Veyrat1,7, Corentin Deprez1, Alexis Coissard1, Xiaoxi Li2,3,4, Frédéric Gay1, Kenji Watanbe5, Takashi Taniguchi5, Zheng Vitto Han2,3,4, Benjamin Piot6, Hermann Sellier1, and Benjamin Sacépé11Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France — 2SYNL, Chinese Academy of Sciences, P.R. China — 3SMSE, University of Science and Technology of China, P.R. China — 4State Key Laboratory of Quantum Optics and Quantum Optics Devices, SXU, P.R. China — 5NIMS, Tsukuba, Japan — 6LNCMI-CNRS-UGA-UPS-INSA-EMFL, Grenoble, France — 7Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Univ. Würzburg, Germany

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 1T and withstanding temperatures up to 110K over micron-long distances [1]. This new and versatile graphene platform opens new avenues for spintronics and topological quantum computation. [1] Veyrat et al., arXiv:1907:02299

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden