Thermal-Noise-Harnessing Single-Electron Memory Pair Circuit and its Application to Full Adder Circuit With Simple Structure

In this study, we designed a thermal-noise-harnessing single-electron memory (SEM) pair circuit. The SEM consists of a capacitor and two tunnel junctions in series. Originally, the SEM shows hysteresis operation, i.e., it can be assumed to have two stable states. The SEM pair circuit has two SEMs and they are connected with a coupling capacitor, we designed. We found that this pair circuit shows four stable states under the condition of T=0[K]. Moreover, it changes the stable states from four to two under the thermal noise condition. Surprisingly, this new two state can be used for binary information processing. As one of its application, we here designed the full adder. Our full adder can be constructed only one SEM pair circuit. By computer simulations, we confirmed they showed correct operation. These results mean the pair circuit can operate under the thermal noise condition, and be used as useful and functional nanodevice with simple structure.