Engineered spin-state transitions of two interacting electrons in semiconductor nanowire quantum dots

Yan Ting Chen*, Shun-Jen Cheng, Chi Shung Tang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Spin properties of two interacting electrons in a quantum dot (QD) embedded in a nanowire with controlled aspect ratio and longitudinal magnetic fields are investigated by using a configuration-interaction (CI) method. The developed CI theory based on a three-dimensional parabolic model provides explicit formulations of the Coulomb matrix elements and allows for straightforward and efficient numerical implementation. Our studies reveal fruitful features of spin-singlet-triplet transitions of two electrons confined in a nanowire QD, as a consequence of the competing effects of geometry-controlled kinetic-energy quantization, Coulomb interaction, and spin-Zeeman energy. The developed theory is further employed to study various spin states of two quantum-confined electrons in the regime of "crossover" dimensionality, from quasi-two-dimensional (disklike) QDs to finite one-dimensional (rodlike) QDs.

Original languageEnglish
Article number245311
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number24
DOIs
StatePublished - 11 Jun 2010

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