Metal Atomic Chains on the Si(100) Surface

The selection of a single-domain Si(100)2×1 surface enables us to make an indium atomic chain over 70 nm in length. Such self-assembled chains can be extended by atomic manipulation using a scanning tunneling microscope tip, as briefly demonstrated in this work on In/Si(100). The advantage of a single-domain Si(100) surface over a double-domain one for the growth of long chains is rationalized, and the mechanism behind the atomic manipulation is noted.