Year: 2022
Type: article
Abstract: The quantum Hall effect can be substantially affected by interfacial coupling between the host two-dimensional electron gases and the substrate, and has been predicted to give rise to exotic topological states. Yet the understanding of the underlying physics and the controllable engineering of this interaction remains challenging. Here we demonstrate the observation of an unusual quantum Hall effect, which differs markedly from that of the known picture, in graphene samples in contact with an antiferromagnetic insulator CrOCl equipped with dual gates. Two distinct quantum Hall phases are developed, with the Landau levels in monolayer graphene remaining intact at the conventional phase, but largely distorted for the interfacial-coupling phase. The latter quantum Hall phase is even present close to the absence of a magnetic field, with the consequential Landau quantization following a parabolic relation between the displacement field and the magnetic field. This characteristic prevails up to 100 K in a wide effective doping range from 0 to 10 13 cm −2 .
Source: Nature Nanotechnology
Institutions: University of Science and Technology of China, Shanxi University, Chinese Academy of Sciences, Institute of Metal Research, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Liaoning Academy of Materials, Shenyang National Laboratory for Materials Science, Peking University, Collaborative Innovation Center of Quantum Matter, ShanghaiTech University, University of Chinese Academy of Sciences, National Institute for Materials Science, Beijing Computational Science Research Center, Institute of Semiconductors
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $11,390
Awards: G2045750406, G2292146533, G2315582310, G2464187331, G2562392311, G2779214953, G28403681, G2868987701, G4397979988, G4636866504, G4703715196, G4997375993, G6399581731, G6517272853, G6634941890, G6655379424, G6673024916, G8317933238, G8490934053, G8508983636, G8590226545, G888181852, G920057190
OpenAlex ID: W4309655949