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Quantum Point Contact (QPC) is a narrow constriction between two wide electrically-conducting regions, of a width comparable to the electronic wave length (nano- to micrometer). Quantum point contacts were first reported in 1988 by a Dutch group (Van Wees et al.) and, independently, by a British group (Wharam et al.).

Çë²ÎÔÄElectronic Transport in Mesoscopic Systems, S. Datta, Cambridge University Press, 1995, Paperback Edition 1997.

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