Figure 4
From: Spin-polarized Wide Electron Slabs in Functionally Graded Polar Oxide Heterostructures
(a) The valance-band and (b) O 1s core-level x-ray photoelectron spectrum of sample A calibrated by carbon 1s (284.6 eV); (c) AFM images of (a) ZnMgO/ZnO double heterostructure (sample B).
