Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 17: Poster Ib

HL 17.25: Poster

Friday, March 4, 2005, 16:30–19:00, Poster TU F

Global view on the electronic properties of two-electron anisotropic quantum dots — •Panagiotis Drouvelis¹, Peter Schmelcher^1,2, and Fotis Diakonos³ — ¹Theoretische Chemie, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany — ²Physikalisches Institut, Philosophenweg 12, Universität Heidelberg, D-69120 Heidelberg, Germany — ³Department of Physics, University of Athens, GR-15771 Athens, Greece

A detailed investigation of the effects of the interaction and anisotropy on the electronic structure and dynamical properties of two-electron quantum dots is being performed. For a circular quantum dot the system is integrable and the pure symmetry spectrum shows level clustering. The introduction of anisotropy serves as a rapid path to chaos for the classical dot with severe impact on the spectrum, thereby showing widening and interaction of the clusters. For particular anisotropic configurations the spectra show level clustering and one specific case turns out to be integrable. The parity symmetries of the corresponding integral of motion lead to singlet-triplet degeneracies. The developed numerical method also allows for a statistical analysis of the energy levels, which show deviations from the standard predictions. For predominantly chaotic phase spaces the results converge to the Wigner surmise. For very strong anisotropies, i.e., for the wire-like limit, the dynamical properties comprise the complete regime from softly interacting to kicked oscillators while the quantum counterpart exhibits intriguing patterns in the spectral sequence of level spacings.