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| A new phenomenon of quantum-dot cellular automata |
| ZENG Ling-gang, WANG Qing-kang, DAI Yong-bing |
| Research Institute of Micro/Nanometer Science and Technology, Shanghai Jiao Tong University, Shanghai 200030, China; School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China |
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Abstract 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 radius R circle. The ratio of R to the electric charge (q) is a constant determined by the parameters of the cell. A QCA cell can be used as charge detector based on the above phenomenon.
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Received: 16 January 2005
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