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Magnetic interaction between coupled quantum dots

  • J. Kolehmainen
  • S.M. Reimann
  • M. Koskinen
  • M. Manninen

Abstract:

We study the magnetic coupling in artificial molecules composed of two and four laterally coupled quantum dots. The electronic ground-state configurations of such systems are determined by applying current spin density functional theory which allows to include effects of magnetic fields. While the ground-state of a two-dot molecule with strong enough inter-dot coupling tends to be antiferromagnetic with respect to the spins of the single dot components, we find that a square lattice of four dots has a ferromagnetic ground state.

PACS. 71. Electronic structure - 73.20.Dx Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) - 85.30.Vw Low-dimensional quantum devices (quantum dots, quantum wires etc.) 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • J. Kolehmainen
    • 1
  • S.M. Reimann
    • 1
  • M. Koskinen
    • 1
  • M. Manninen
    • 1
  1. 1.University of Jyväskylä, Physics Department, PO Box 35, 40351 Jyväskylä, FinlandFI

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