Quantum Hall effect in a CVD-grown oxide

Oleksandr Zheliuk; Yuliia Kreminska; Qundong Fu; Davide Pizzirani; Andrew A L N Ammerlaan; Ying Wang; Sardar Hameed; Puhua Wan; Xiaoli Peng; Steffen Wiedmann; Zheng Liu; Jianting Ye; Uli Zeitler

doi:10.1038/s41467-024-54014-6

Quantum Hall effect in a CVD-grown oxide

Nat Commun. 2024 Nov 20;15(1):10052. doi: 10.1038/s41467-024-54014-6.

Authors

Oleksandr Zheliuk^{1

2}, Yuliia Kreminska³, Qundong Fu⁴, Davide Pizzirani^{5

6}, Andrew A L N Ammerlaan^{5

6}, Ying Wang³, Sardar Hameed^{3

7}, Puhua Wan³, Xiaoli Peng³, Steffen Wiedmann^{5

6}, Zheng Liu⁴, Jianting Ye⁸, Uli Zeitler^{9

10}

Affiliations

¹ High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, The Netherlands. oleksandr.zheliuk@ru.nl.
² Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands. oleksandr.zheliuk@ru.nl.
³ Device Physics of Complex Materials, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
⁴ School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
⁵ High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, The Netherlands.
⁶ Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands.
⁷ Department of Physics, University of Malakand, Malakand, Pakistan.
⁸ Device Physics of Complex Materials, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands. j.ye@rug.nl.
⁹ High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, The Netherlands. uli.zeitler@ru.nl.
¹⁰ Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands. uli.zeitler@ru.nl.

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.