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held electron in the DB will be advantageous over the relatively weakly held
P electron. An important advantage emerges trivially because of the relative
electronic sizes of the DB and P atoms. Being small and well confined, the DB
interacts with fewer surrounding nuclei than the P atom which encompasses
an order of magnitude larger volume. The DB as a result will experience fewer
nuclear spin-electron spin decoherence effects.
10 Conclusions
In this paper, we outlined our recent and current efforts in building atom-scale
quantum-dot cellular automata circuits on a silicon surface. As a building block
we use the silicon dangling bond on a H-Si(001) surface, shown to act as a
quantum dot. The fabrication, experimental STM imaging, and charging char-
acteristics of the dangling bond and their assemblies are discussed. We then show
how precise assemblies of such dots can be created to form artificial molecules.
Such complex structures can be used as systems with custom optical properties,
circuit elements for quantum-dot cellular automata, and quantum computing.
Considerations on macro-to-atom connections are discussed.
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