Cascaded quantum wires and integrated designs for complex logic functions: nanoelectronic full adder

Complex logic functions based on cascading quantum wires (QWs) defined in a GaAs/AlGaAs-based two-dimensional electron gas by electron-beam lithography and wet chemical etching are demonstrated. The concept of connected QWs leads to a nanoelectronic full adder with independent carry- and sum-bit structures. Monolithic designs were fabricated and were found to also demonstrate simultaneous switching with common thresholds between high and low logic levels.