期刊
SCIENCE
卷 367, 期 6479, 页码 781-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax8201
关键词
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资金
- H2020 ERC grant QUEST [637815]
- Elemental Strategy Initiative
- A3 Foresight by JSPS
- CREST, JST [JPMJCR15F3]
- National Key R&D Program of China [2019YFA0307800, 2017YFA0206302]
- National Natural Science Foundation of China (NSFC) [11504385, U1932151, 51627801]
- State Key Laboratory of Quantum Optics and Quantum Optics Devices [KF201816]
- European Research Council (ERC) [637815] Funding Source: European Research Council (ERC)
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 insulating state is observed that 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 through a suitable screening of the Coulomb interaction with the high dielectric constant of a strontium titanate (SrTiO3) substrate. Robust helical edge transport emerged at magnetic fields as low as 1 tesla and withstanding temperatures up to 110 kelvin over micron-long distances. This versatile graphene platform may find applications in spintronics and topological quantum computation.
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