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Sample structure of the ordered quantum rings and illustration of lateral alignment of quantum dots/rings by stacking quantum dots in multilayers.
AFM images of quantum rings grown on GaAs (100), (311)B, and (511)B surfaces. The image scale is 2 μm × 2 μm from (100) surface and 1 μm × 1 μm for the other two surfaces. The bottom illustration shows transition from one-dimensional ordering on (100) surface to two-dimensional array on high index surfaces.
Cross-sectional line-profiles of quantum rings grown on (a) GaAs (100) surface; (b) GaAs (311)B surface; and (c) GaAs (511)B surface. The line-profiles are taken along [01-1], [23-3], and [25-5] for (100), (311)B, and (511)B, respectively. The right side of the line-profiles is the AFM images of quantum rings grown on (100), (311)B, and (511)B surfaces. The insets are AFM images of a single quantum ring grown on each surface. The scale bars in the AFM images are 500 nm.
AFM images of ordered quantum rings on the top of multilayered In0.4Ga0.6As quantum dot templates grown on (a) GaAs (100), (b) (311)B, and (c) (511)B surfaces. The second row images are fast Fourier transforms taken from the corresponding AFM images: (d) GaAs (100), (e) (311)B, and (f) (511)B surfaces. The insets are zoom-in AFM images showing different quantum ring lattice structures.
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