Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.23: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Few-fermion systems in one dimension — •Gerhard Zürn1, Andrea Bergschneider1, Vincent Klinkhamer1, Simon Murmann1, Thomas Lompe1,2,3, Andre N. Wenz1, and Selim Jochim1,31Physikalisches Institut, Universität Heidelberg — 2Department of Physics, Massachusetts Institute of Technology, Cambridge — 3ExtreMe Matter Institute EMMI, GSI Darmstadt

Deterministically prepared samples of ultracold atoms are ideal benchmark systems to test theoretical models of few-fermion systems. We present experiments on 6Li atoms in quasi one dimensional confining potentials with tunable interactions.
In one measurement, we perform radio frequency spectroscopy to measure the energy of a single impurity particle interacting repulsively with a defined number of identical majority particles of different spin. We study the crossover from single particles to the many-body limit by adding majority particles one by one. Within only four majority particles, we observe a fast convergence of the normalized interaction energy towards the analytic many-body prediction. Extending these measurements to higher dimensions would allow us to study polaronic physics. By adding impurity particles one by one into a large Fermi sea, we could study the emergence of polaron-polaron interactions.
Investigating attractively interacting systems, we observe that for increasing interaction strength the pair correlations in the system increase. These correlations lead to a strong odd-even effect of the separation energy of a single particle from the system, similar to the one observed for neutron separation experiments in nuclei.

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