https://doi.org/10.1007/s100530170134
Magnetic properties of quantum dots and rings
1
Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
2
Department of Mathematical Physics, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
3
NORDITA, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
Corresponding author: a manninen@phys.jyu.fi
Received:
5
December
2000
Published online: 15 September 2001
Exact many-body methods as well as current-spin-density functional theory are used to study the magnetism and electron localization in two-dimensional quantum dots and quasi-one-dimensional quantum rings. Predictions of broken-symmetry solutions within the density functional model are confirmed by exact configuration interaction (CI) calculations: In a quantum ring the electrons localize to form an antiferromagnetic chain which can be described with a simple model Hamiltonian. In a quantum dot the magnetic field localizes the electrons as predicted with the density functional approach.
PACS: 73.21.La – Quantum dots / 73.43.Nq – Quantum phase transitions / 85.35.Be – Quantum well devices (quantum dots, quantum wires, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
