Issue |
Europhys. Lett.
Volume 64, Number 2, October 2003
|
|
---|---|---|
Page(s) | 232 - 238 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00312-y | |
Published online | 01 November 2003 |
Two-electron anisotropic quantum dots
1
Theoretische Chemie, Universität Heidelberg
Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
2
Department of Physics, University of Athens - GR-15771
Athens, Greece
Corresponding authors: panos@tc.pci.uni-heidelberg.de, peter@tc.pci.uni-heidelberg.de, fdiakono@cc.uoa.gr
Received:
17
January
2003
Accepted:
5
August
2003
A detailed investigation of the effects of interaction and
anisotropy in the electronic structure and dynamical properties of
two-electron quantum dots is performed. It is shown that a small
anisotropy eliminates the shell structure and represents a rapid
path to chaos. The level clustering, energy gaps and the
accompanying classical dynamics are investigated among others for
the frequency ratios . For n=2 the
system is integrable and the corresponding constant of motion is
constructed. The eigenstates pair in singlet-triplet degenerate
subspaces. In between these ratios avoided crossings dominate the
spectra. For very strong anisotropies, the classical dot comprises
the complete regime from softly interacting to kicked
oscillators. Its quantum counterpart shows remarkable spectral
patterns.
PACS: 73.21.La – Quantum dots / 03.65.-w – Quantum mechanics / 71.70.-d – Level splitting and interactions
© EDP Sciences, 2003
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