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Direct imaging of quantum wires nucleated at diatomic steps
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color) AFM image of the growth surface during the initial stage of nanowires formation. Note that most of nanowires are located on the upper terraces close to the step boundary. Similarly nucleated nanowires are highlighted on the AFM image with dotted circles. The nanowires circled in blue are seen to run parallel to the step edge for practically their entire length whereas most nanowires cross the step at a small angle.

Image of FIG. 2.
FIG. 2.

-contrast image (raw data) of an InP capped nanowire grown by solid source molecular beam epitaxy on (001) InP substrate. This image, taken with a dedicated aberration-corrected STEM VG HB603, enables the two fcc sublattices of In (brighter contrasts) and atoms constituting the zinc-blende structure of the disordered alloy to be directly distinguished. Stronger intensities are observed in the projected positions of the atomic columns.

Image of FIG. 3.
FIG. 3.

(Color) Low pass filtered high resolution -contrast image obtained from a magnified region of the central part of the nanowire interface. The existence of a diatomic step is clearly visible on the dotted line. The step location is easily found by analyzing in which diatomic column the -contrast associated with is no longer visible. This situation corresponds, for the contrast level of this image, to the existence of atomic columns of P atoms.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct imaging of quantum wires nucleated at diatomic steps