Thermally stable quantum Hall effect in a gated ferroelectric-graphene heterostructure

Dey, Anubhab; Cottam, Nathan; Makarovskiy, Oleg; Yan, Wenjing; Mišeikis, Vaidotas; Coletti, Camilla; Kerfoot, James; Korolkov, Vladimir; Eaves, Laurence; Linnartz, Jasper F.; Kool, Arwin; Wiedmann, Steffen; Patanè, Amalia

Abstract

The quantum Hall effect is widely used for the investigation of fundamental phenomena, ranging from topological phases to composite fermions. In particular, the discovery of a room temperature resistance quantum in graphene is significant for compact resistance standards that can operate above cryogenic temperatures. However, this requires large magnetic fields that are accessible only in a few high magnetic field facilities. Here, we report on the quantum Hall effect in graphene encapsulated by the ferroelectric insulator CuInP2S6. Electrostatic gating of the graphene channel enables the Fermi energy to be tuned so that electrons in the localized states of the insulator are in equilibrium with the current-carrying, delocalized states of graphene. Due to the presence of strongly bound states in this hybrid system, a quantum Hall plateau is observed over a wide range of temperatures in relatively modest magnetic fields.

Citation

Dey, A., Cottam, N., Makarovskiy, O., Yan, W., Mišeikis, V., Coletti, C., …Patanè, A. (2023). Thermally stable quantum Hall effect in a gated ferroelectric-graphene heterostructure. Communications Physics, 6, Article 216. https://doi.org/10.1038/s42005-023-01340-8

• Journal Article Type: Article
• Acceptance Date: Aug 9, 2023
• Online Publication Date: Aug 17, 2023
• Publication Date: Aug 17, 2023
• Deposit Date: Aug 9, 2023
• Publicly Available Date: Aug 23, 2023
• Journal: Communications Physics
• Electronic ISSN: 2399-3650
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Article Number: 216
• DOI: https://doi.org/10.1038/s42005-023-01340-8
• Keywords: General Physics and Astronomy
• Public URL: https://nottingham-repository.worktribe.com/output/24141979
• Publisher URL: https://www.nature.com/articles/s42005-023-01340-8
• Additional Information: Received: 12 June 2023; Accepted: 9 August 2023; First Online: 17 August 2023; : The authors declare no competing interests.