Edge polarization topology integrated with sliding ferroelectricity in Moiré system

Wen-Cheng Fan, Zhao Guan, Lu-Qi Wei, Hao-Wen Xu, Wen-Yi Tong, Ming Tian, Neng Wan, Cheng-Shi Yao, Jun-Ding Zheng, Bin-Bin Chen, Ping-Hua Xiang (), Ni Zhong () and Chun-Gang Duan ()
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Wen-Cheng Fan: East China Normal University
Zhao Guan: East China Normal University
Lu-Qi Wei: East China Normal University
Hao-Wen Xu: East China Normal University
Wen-Yi Tong: East China Normal University
Ming Tian: Southeast University
Neng Wan: Southeast University
Cheng-Shi Yao: East China Normal University
Jun-Ding Zheng: East China Normal University
Bin-Bin Chen: East China Normal University
Ping-Hua Xiang: East China Normal University
Ni Zhong: East China Normal University
Chun-Gang Duan: East China Normal University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Van der Waals moiré heterostructure have been found to exhibits a robust interfacial ferroelectricity down to atomic thickness, and discovering and understanding the complex polarization state in moiré systems is of fundamental interest to condensed-matter research. In this study, we examine the moiré ferroelectricity in twisted h-BN heterostructure by piezoresponse force microscopy. Due to atomic reconstruction, triangular moiré patterns are detected, and we directly observe sliding ferroelectricity in the center of triangular moiré patterns as well as robust in-plane polarization topology emerging at the boundary of adjacent triangles, which we call edge polarization. The edge polarization possesses non-trivial and robust vortex polarization topology. Our calculations trace the origin of this phenomenon to joined piezoelectric effects with sliding ferroelectricity. This work provides intuitive insights to explore the unique moiré ferroelectricity in non-polar background matrix, and the inherent stability of the topological structures ensures reliable and durable performance of electronic devices.

Date: 2025
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DOI: 10.1038/s41467-025-58877-1

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