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Immersed Quantum Systems : A Sodium Bose-Einstein Condensate for Polaron Studies

Appmeier, Jens

German Title: Gemischte Quantensysteme : Ein Natrium Bose-Einstein-Kondensat für Polaronen-Physik

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Abstract

The subject of this work is the setup of an experiment to study immersed quantum systems using bosonic 23Na and fermionic 6Li. Bose-Einstein condensation of 23Na has been achieved in two di erent magnetic trap con gurations, namely the plugged quadrupole trap and the cloverleaf trap. Both are compared with respect to their suitability for a two-species experiment using this particular isotopes. In such a mixture, it should be possible to investigate polarons, which are quasiparticles, emerging when one of components of the mixture has only a very rare concentration. Furthermore, a theoretical study of the polaron will be discussed. A mean- eld calculation has been carried out in order to simulate the impurity behavior in the presence of a large bosonic background gas.

Translation of abstract (German)

In der vorliegenden Arbeit wird der Aufbau eines neuen Experiments zur Untersuchung ultrakalter bosonischer und fermionischer Quantengase beschrieben. Bose-Einstein Kondensation von 23Na Atomen wird in zwei verschiedenen Magnetfallenkonfi gurationen, der "plugged" Quadrupolfalle und der Kleeblattfalle erreicht. Außerdem werden beide Fallentypen bezüglich ihrer Eignung für Gemischexperimente mit 23Na und 6Li verglichen. In einem solchen Gemisch sollte es möglich sein Polaronen zu untersuchen. Diese Quasiteilchen entstehen, sobald eine Komponente des Natrium-Lithium Gemisches nur noch in einer sehr geringen Konzentration vorliegt. Der Grenzfall eines einzelnen Teilchens in einem bosonischen Hintergrund wird theoretisch betrachtet und anhand einer numerischen Simulation untersucht.

Document type: Dissertation
Supervisor: Oberthaler, Prof. Dr. Markus
Date of thesis defense: 13 July 2010
Date Deposited: 09 Aug 2010 07:34
Date: 2010
Faculties / Institutes: The Faculty of Physics and Astronomy > Kirchhoff Institute for Physics
DDC-classification: 530 Physics
Controlled Keywords: Bose-Einstein-Kondensation, Polaron, Magnetfalle
Uncontrolled Keywords: bose-einstein condensation , polaron , sodium , cloverleaf trap
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