Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1545815 | Physica E: Low-dimensional Systems and Nanostructures | 2010 | 4 Pages |
Abstract
We consider a quantum dot embedded in a three-dimensional nanowire with tunable aspect ratio a. A configuration interaction theory is developed to calculate the energy spectra of the finite 1D quantum dot systems charged with two electrons in the presence of magnetic fields B along the wire axis. Fruitful singlet-triplet transition behaviors are revealed and explained in terms of the competing exchange interaction, correlation interaction, and spin-Zeeman energy. In the high aspect ratio regime, the singlet-triplet transitions are shown designable by tuning the parameters a and B. The transition also manifest the highly correlated nature of long nanowire quantum dots.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Y.T. Chen, C.C. Chao, S.Y. Huang, C.S. Tang, S.J. Cheng,