Singlet-triplet transitions in highly correlated nanowire quantum dots

Y. T. Chen, C. C. Chao, S. Y. Huang, C. S. Tang, Shun-Jen Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish
Pages (from-to)837-840
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number4
DOIs
StatePublished - 1 Feb 2010

Keywords

  • Correlation
  • Exchange
  • Nanowire quantum dot
  • Singlet-triplet transition

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