T. Tanamoto et R. Katoh, THE POSSIBILITY OF HIGHER TEMPERATURE OPERATION IN QUANTUM CELLULAR-AUTOMATA (QCA), IEICE transactions on electronics, E79C(11), 1996, pp. 1550-1556
Quantum Cellular Automaton (QCA), which is one of the candidates for f
uture integrable electron devices, is investigated from the viewpoint
of operation temperature. The extended Hubbard model which can extract
the physical essence of QCA is used to analyze the inter-cell interac
tion for a layered cell structure. We found that the operation energy
estimated from the energy gap between the ground state and excited sta
tes of the layered structure is large enough to allow room temperature
operation even if the size of quantum dot is as large as 500 Angstrom
. The layered cell structure is found to be suitable for a memory appl
ication.