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Journal of Zhejiang University SCIENCE A

ISSN 1673-565X(Print), 1862-1775(Online), Monthly

2005 Vol.6 No.10 P.1090-1094

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

linggang_z@sohu.com

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.

Key words: Quantum-dot cellular automata (QCA), Quantum dot, Hubbard-type Hamiltonian


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DOI:

10.1631/jzus.2005.A1090

CLC number:

TN603

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Received:

2005-01-16

Revision Accepted:

2005-04-21

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