Volume 66, Number 5, June 2004
|Page(s)||701 - 707|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 May 2004|
Re-entrant pinning of Wigner molecules in a magnetic field due to a Coulomb impurity
Departement Natuurkunde, Universiteit Antwerpen (Campus Drie Eiken) B-2610 Antwerpen, Belgium
2 Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology - al. Mickiewicza 30, 30-059 Kraków, Poland
Accepted: 29 March 2004
Pinning of magnetic-field–induced Wigner molecules (WMs) confined in parabolic two-dimensional quantum dots by a charged defect is studied by an exact diagonalization approach. We found a re-entrant pinning of the WMs as a function of the magnetic field, a magnetic-field–induced re-orientation of the WMs and a qualitatively different pinning behaviour in the presence of a positive and negative Coulomb impurity.
PACS: 73.21.La – Quantum dots / 73.20.Qt – Electron solids
© EDP Sciences, 2004
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