Atomic-scale manipulation of polar domain boundaries in monolayer ferroelectric In2Se3

Fan Zhang, Zhe Wang, Lixuan Liu, Anmin Nie, Yanxing Li, Yongji Gong, Wenguang Zhu () and Chenggang Tao ()
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Fan Zhang: Department of Physics, Virginia Tech
Zhe Wang: University of Science and Technology of China
Lixuan Liu: Beihang University
Anmin Nie: Yanshan University
Yanxing Li: University of Texas at Austin
Yongji Gong: Beihang University
Wenguang Zhu: University of Science and Technology of China
Chenggang Tao: Department of Physics, Virginia Tech

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

Abstract: Abstract Domain boundaries have been intensively investigated in bulk ferroelectric materials and two-dimensional materials. Many methods such as electrical, mechanical and optical approaches have been utilized to probe and manipulate domain boundaries. So far most research focuses on the initial and final states of domain boundaries before and after manipulation, while the microscopic understanding of the evolution of domain boundaries remains elusive. In this paper, we report controllable manipulation of the domain boundaries in two-dimensional ferroelectric In2Se3 with atomic precision using scanning tunneling microscopy. We show that the movements of the domain boundaries can be driven by the electric field from a scanning tunneling microscope tip and proceed by the collective shifting of atoms at the domain boundaries. Our density functional theory calculations reveal the energy path and evolution of the domain boundary movement. The results provide deep insight into domain boundaries in two-dimensional ferroelectric materials and will inspire inventive applications of these materials.

Date: 2024
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DOI: 10.1038/s41467-023-44642-9

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