Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Quantum Chaos II
DY 24.7: Vortrag
Donnerstag, 29. März 2012, 13:00–13:15, MA 001
Complex dynamics in two-electron quantum dots — •Sebastian Schröter1, Paul-Antoine Hervieux2, Giovanni Manfredi2, Johannes Eiglsperger3, Moritz Schönwetter1,4, and Javier Madroñero1 — 1TU München — 2CNRS, IPCMS Strasbourg — 3Universität Regensburg — 4MPI PKS, Dresden
To characterise the degree of chaoticity in a quantum system a variety of measures have been established in the literature. A detailed analysis of various spectral properties combined with investigations of the classical analogue and semiclassical properties of a planar anharmonic two-electron quantum dot enables us to classify this system in the regime of weak quantum chaos. The core of our quantum analysis is an ab initio approach for planar two-electron quantum dots including full Coulomb interaction. The quantum dot is approximated by an harmonic potential with an additional quartic perturbation introducing irregularity in the system. Via the strength of the quartic potential the transition between regular and choatic dynamics can be tuned. Our model is experimentally accessible and impacts on relevant properties of coherence in many-body systems [1] can be addressed within our ab initio approach.
[1] G. Manfredi, P.-A. Hervieux, New J. Phys. 11 (2009), 013050. – Phys. Rev. Lett. 100 (2008), 050405. – Phys. Rev. Lett. 97 (2006), 190404.