Singlet–triplet transitions in highly correlated nanowire quantum dots
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. Fr...
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Published in | Physica. E, Low-dimensional systems & nanostructures Vol. 42; no. 4; pp. 837 - 840 |
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Main Authors | , , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.02.2010
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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ISSN: | 1386-9477 1873-1759 |
DOI: | 10.1016/j.physe.2009.11.084 |