Competing mechanisms for singlet-triplet transition in artificial molecules

Details Competing mechanisms for singlet-triplet transition in artificial molecules Competing mechanisms for singlet-triplet transition in artificial molecules

2004-05-10

arxiv.org/abs/cond-mat/0405187v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. B - Rapid Comm. - 5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.69.201308

We study the magnetic field induced singlet/triplet transition for two electrons in vertically coupled quantum dots by exact diagonalization of the Coulomb interaction. We identify the different mechanisms occurring in the transition, involving either in-plane correlations or localization in opposite dots, depending on the field direction. Therefore, both spin and orbital degrees of freedom can be manipulated by field strength and direction. The phase diagram of realistic devices is determined.

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