Abstract
We experimentally demonstrated single-electron operations of an AND/NAND logic circuit based on a self-organized GaAs quantum-dot (QD) network fabricated by applying a selective-area metalorganic vapor-phase epitaxy technique. Single-electron logic operations using four cooperating single-electron tunneling (SET) transistors has been tested. This logic circuit has an architecture based on a binary decision diagram (BDD) using a Coulomb blockade (CB) in GaAs QDs, which is a representation of digital logic functions using directed graphs. BDD node devices consisting of two SET transistors achieved a two-way path switching operation in single-electron mode due to the CB effects which appeared complementarily in the two SET transistors at 1.9 K. We also demonstrated an AND/NAND operation in a logic circuit by integrating two BDD nodes.
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