Quantum Hall effect in a CVD-grown oxide

Oleksandr Zheliuk (), Yuliia Kreminska, Qundong Fu, Davide Pizzirani, Emily L.Q.N. Ammerlaan, Ying Wang, Sardar Hameed, Puhua Wan, Xiaoli Peng, Steffen Wiedmann, Zheng Liu, Jianting Ye () and Uli Zeitler ()
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Oleksandr Zheliuk: Radboud University
Yuliia Kreminska: University of Groningen
Qundong Fu: Nanyang Technological University
Davide Pizzirani: Radboud University
Emily L.Q.N. Ammerlaan: Radboud University
Ying Wang: University of Groningen
Sardar Hameed: University of Groningen
Puhua Wan: University of Groningen
Xiaoli Peng: University of Groningen
Steffen Wiedmann: Radboud University
Zheng Liu: Nanyang Technological University
Jianting Ye: University of Groningen
Uli Zeitler: Radboud University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Two-dimensional (2D) electron systems are promising for investigating correlated quantum phenomena. In particular, 2D oxides provide a platform that can host various quantum phases such as quantized Hall effect, superconductivity, or magnetism. The realization of such quantum phases in 2D oxides heavily relies on dedicated heterostructure growths. Here we show the integer quantum Hall effect achieved in chemical vapor deposition grown Bi2O2Se - a representative member of a more accessible oxide family. A single or few subband 2D electron system can be prepared in thin films of Bi2O2Se, where the film thickness acts as the key subband design parameter and the occupation is determined by the electric field effect. This oxide platform exhibits characteristic advantages in structural flexibility due to its layered nature, making it suitable for scalable growth. The unique small mass distinguishes Bi2O2Se from other high-mobility oxides, providing a new platform for exploring quantum Hall physics in 2D oxides.

Date: 2024
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DOI: 10.1038/s41467-024-54014-6

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