Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.19: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Correlations in one dimensional few-fermion systems — •Gerhard Zürn1, Andre N. Wenz1, Simon Murmann1, Vincent Klinkhamer1, Andrea Bergschneider1, Thomas Lompe1, 2, and Selim Jochim1, 2 — 1Physikalisches Institut Universität Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Darmstadt
We present experiments on few-fermion systems of 6Li atoms in quasi one dimensionally confining potentials with tunable interaction. 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 a few-particle system to a many-particle system by adding majority particles one by one. We observe that already four majority particles are enough to describe the properties of the impurity by that of a polaron-like particle, i.e. by a single impurity dressed by a 1D Fermi sea. We have also performed measurements in the so-called super-Tonks regime and studied spin correlations in these systems. We have found strong indications that the system exhibits ferromagnetic correlations. Investigating attractively interacting systems we observe that for increasing interaction strength the pair correlations in the system increases. This correlation leads to a strong odd-even effect of the single particle dissociation energy similar to the one observed for nuclei.