A new phenomenon of quantum-dot cellular automata
Zeng Ling-gang, Qingkang Wang, Dai Yong-Bing · Journal of Zhejiang University Science · 2005
If an external point charge and the movable charges of an isolated quantum-dot cellular automata (QCA) cell have the same polarity, the point charge greatly affects the polarization (P) of the cell only when it is in a narrow band with periodically changing width. The center of the band is on a radiusR circle. The ratio ofR to the electric charge (q) is a constant determined by the paremeters of the cell. A QCA cell can be used as charge detector based on the above phenomenon.