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978-3-8439-1996-8, Reihe Physik
Probing superfluid properties in strongly correlated Fermi gases with high spatial resolution
190 Seiten, Dissertation Universität Hamburg (2014), Softcover, B5
Superfluidity is one of the most striking macroscopic phenomena which have their origins in the quantum nature of the underlying physics. The superfluid flow is strongly connected to superconductivity in solids and its understanding is an outstanding problem in modern physics. Particularly interesting are strongly correlated systems since they might hold the key to develop new high-temperature superconductors.
This thesis presents an apparatus to create and to study clouds of ultracold fermionic lithium-6 with tunable interaction strength and dimensionality. The apparatus is applied to investigate the speed of sound and the superfluid critical velocity in the crossover from Bose-Einstein condensation to Bardeen-Cooper-Schrieffer superfluidity. The results set benchmarks for theories describing strongly correlated systems.