fig2

Figure 2. (A) HAADF-STEM image of HZO films with O phase; (B) An enlarged view of the red box in (A) indicates an HZO structure with two 90° domains; (C) The sketches of the two types of 90° DWs include left O_[010]/O_[001] DW and right O_[001]/O_[010] DW; (D-E) The atomic structures (top panels) and LDOS of two types of 90° DWs from the left and right DWs of Figure (C) respectively. Red rectangles mark the oxygen-ion diminishing and accumulating interfaces. Each layer of LDOS includes the states of two Hf and four O. HAADF-STEM: High-angle-annular-dark-field scanning transmission electron microscopy; HZO: Hf_0.5Zr_0.5O₂; DWs: domain walls; LDOS: layer-resolved density of states.