Nanowires and Nanorings at the Atomic Level

The step-flow growth mode is used to fabricate Si and Ge nanowires with a width of 3.5 nm and a thickness of one atomic layer (0.3 nm) by self-assembly. Alternating deposition of Ge and Si results in the formation of a nanowire superlattice covering the whole surface. One atomic layer of Bi terminating the surface is used to distinguish between the elements Si and Ge. A difference in apparent height is measured in scanning tunneling microscopy images for Si and Ge. Also, different kinds of two-dimensional $\mathrm{S}\mathrm{i}/\mathrm{G}\mathrm{e}$ nanostructures like alternating Si and Ge nanorings having a width of 5–10 nm were grown.