Extended Data Fig. 4: Metal plane displacement across VDWs and the proposed VDW structure viewed along different projections.
From: Electric-field-induced domain walls in wurtzite ferroelectrics
a, High-magnification HAADF-STEM image of the electric-field-induced VDW in ScGaN. The auxiliary lines in the figure trace the centre of each metal atom column. The position of the centre is obtained from 2D Gaussian fitting. A shift in the metal planes while crossing a VDW is evident. b, The proposed VDW structure viewed along different projections. The structure maintains the sixfold rotational symmetry of the host wurtzite material and satisfies the symmetry requirement on the manifestation of alternate domain and domain-wall projections at regular 60° intervals when observed from a consistent viewing angle. The in-plane distances of the metal atoms within the domain wall and bulk ScGaN from DFT calculations are indicated, showing the in-plane lattice expansion at the VDW.
