|By: Richard Mowat||POSTED: 07/29/12 6:31 AM
FILED AS: Graphene
COMMENTS FEED: RSS 2.0;
Honolulu, HI (PRWEB) August 5, 2006
A single electron transistor (SET) is a device in which a quantum dot (QD) is connected with source and drain contacts through small tunnel junctions. A QD is a small metallic island in which electrons are confined. Therefore, it is sometimes compared with a natural atom, where electrons are confined in the Coulomb potential in a much smaller scale. When the discrete levels and the shell structure are clearly formed, the quantum dot is called an artificial atom. In the SWCNT QD, electrons are confined in a length direction as well as a circumference direction.
The researchers at RIKEN demonstrated the artificial-atom nature of the SWCNT QD, with observations of shell structures and the Zeeman splitting of the single particle states.
Read the full article on the Nanowerk website.
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By Michael Berger, Copyright 2006 Nanowerk LLC