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Magnetic properties of quantum dots and rings |
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| Authors: | M. Manninen M. Koskinen S.M. Reimann B. Mottelson |
| Affiliation: | Department of Physics, University of Jyv?skyl?, P.O. Box 35, FIN-40351 Jyv?skyl?, Finland, FI Department of Mathematical Physics, Lund University, P.O. Box 118, SE-22100 Lund, Sweden, SE NORDITA, Blegdamsvej 17, DK-2100 Copenhagen, Denmark, DK |
| Abstract: | 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. Received 5 December 2000 |
| Keywords: | PACS. 73.21.La Quantum dots – 73.43.Nq Quantum phase transitions – 85.35.Be Quantum well devices (quantum dots, quantum wires, etc.) |
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