Based on simultaneous selective growth and composition modulation, Zn1
-xCdxSe wire structures are spontaneously formed on cleavage-induced G
aAs (110) surfaces by deposition of a Zn1-yCdySe (x > y) alloy layer.
The wire structures are formed on the top edge of the steps introduced
by cleavage. These wires show a strongly polarized emission and a lar
ge piezoelectric effect, implying a potential for applications in nonl
inear optoelectronic devices. This paper discusses a novel approach to
semiconductor nanostructures.