Silicon mechanosynthesis demonstration (paper)
(wiki-TODO: Add image from paper showing the before and after of the ripped out atom)
Make no mistake, achieving this feat with the technology of back then and (still now 2021) was probably many many many hours of work.
Technology will have a long way to go till something like works really fast and reliable,
meaning at MHz level reaction rates and low error rated akin to digital logic.
External link to the paper
Ripping out and redepositing sigle silicon atoms on silicon surface:
Noriaki Oyabu, Oscar Custance, Insook Yi, Yasuhiro Sugawara, Seizo Morita, "Mechanical vertical manipulation of selected single atoms by soft nanoindentation using near contact Atomic Force Microscopy," Phys. Rev. Lett. 90(2 May 2003):176102; http://link.aps.org/abstract/PRL/v90/e176102
pdf on academia.edu (78K)