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O: Fachverband Oberflächenphysik
O 77: Nanostructures at surfaces:1D, 2D, networks II
O 77.7: Vortrag
Donnerstag, 12. März 2026, 12:00–12:15, HSZ/0204
Ferroelectric vortices in elemental Bismuth square islands — •Shasha Xue and Hao Zheng — Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China
Ferroelectric vortices, with their unique topological polarization patterns, show great potential for next-generation electronics. Although they have been observed in compounds, their realization in single-element materials has remained elusive. Here, we experimentally prepare three-bilayer Bi(110) square-shaped islands on high-TC superconductor (Bi2Sr2CaCu2O8+δ) substrates by molecular beam epitaxy. Scanning tunneling microscopy/spectroscopy combined with first-principal calculations verify in-plane polarization and a ferroelectric vortex state in our islands, as well as reveals exceptional vortex stability against electric-field-driven switching. This work pioneers single-element ferroelectric vortices, advances topological ferroelectrics design and expands the understanding in related fundamental physics.
Keywords: Ferroelectric vortices; Single-element ferroelectrics; In-plane polarization; Electric-field stability; Scanning Tunneling Microscope