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  Few-body physics in ultracold Fermi gases

Ottenstein, T. B. (2010). Few-body physics in ultracold Fermi gases. PhD Thesis, Ruprecht-Karls Universität, Heidelberg.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-7254-2 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-7255-F
Genre: Thesis

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 Creators:
Ottenstein, Timo Bastian1, Author           
Jochim, Selim1, Referee           
Weidemüller, Matthias2, Referee           
Affiliations:
1Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society, ou_904547              
2Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907546              

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 Abstract: This thesis reports on experimental studies of few-body physics in ultracold Fermi gases. The main part is devoted to the first realisation of an ultracold threecomponent Fermi gas in thermal equilibrium that consists of atoms in the three lowest spin states of 6Li. In first experiments the collisional stability of the gas was investigated in dependence of the interparticle interaction. The interaction strength was tuned by an external magnetic field employing Feshbach resonances in all three two-body scattering channels. At two magnetic field values a resonant enhancement of threebody loss was observed that can be explained by an Efimov-like trimer consisting of one atom in each of the three states which crosses the continuum twice in the studied magnetic field region. The behaviour of three-body loss rates could be understood by taking into account a variation of the lifetime of the trimer with the magnetic field. These experiments were performed with large ensembles of atoms. A finite deeply degenerate Fermi gas consisting of a controlled number of atoms may serve as a clean model for finite Fermi systems as for example atomic nuclei. An approach for the preparation of such a gas is discussed and first experimental steps are presented.

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Language(s): eng - English
 Dates: 2010-02-03
 Publication Status: Accepted / In Press
 Pages: IV, 147 S. : Ill., graph. Darst.
 Publishing info: Heidelberg : Ruprecht-Karls Universität
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 440725
 Degree: PhD

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