> https://en.wikipedia.org/wiki/There%27s_Plenty_of_Room_at_th...

Yes, single-atom manipulation has already been demonstrated:

* https://en.wikipedia.org/wiki/IBM_(atoms)

Can you make transistors using that technique? Can you smaller?

You could make maybe ten transistors or so, but no more. That technique is quite literally pushing atoms one by one with a sharp needle. Not scalable, though maybe useful for some quantum computing platforms’ fabrication since we’re at early stages.

And you could write nice sci-fi about subatomic transistors, but forget making them in this reality.