Observation and manipulation of two-dimensional topological polar texture confined in moiré interface

Topological polar structures in ferroelectric thin films have become an emerging research field for exotic phenomena. Due to the prerequisite of the intricate balance among the intrinsic dipolar anisotropy, the imposed electric and mechanical boundary, the topological polar domains are predominantly formed within complex oxides. Here, combining the microscopic polarization measurement via Piezoresponse Force Microscopy and the atomic displacement mapping via Scanning Transmission Electron Microscopy, we report the direct observation of atomically thin topological polar textures in twisted boron nitride system, which is well confined at the twisted interface. Leveraging the advantages of the sliding switching mechanism and atomically thin nature, we demonstrate nonvolatile manipulation of the topological polar textures, which is crucial for potential applications. This result provides opportunities to create truly 2D topological polar textures with dynamical controllability, which would render the exploration on the previously unknown physical phenomena and functional devices feasible.