Forschungsthemen: "Formation of Correlations and Structure"

During last years there has been established a collaboration concerning subjects of quantum transport on short time scales. There is the common will to establish a more close connection and collaboration in the way that each of the member is working in his special field with separate projects but in close exchange with the others to promote the understanding how correlations are formed in dense interacting systems. The collaboration will communicate with small workshop meetings. This should serve as a nucleation point for other theorists to join the discussion. The home institute of that international working group is the Technical University Chemnitz and the Max-Planck Institute for Complex Systems in Dresden.

International working group: Formation of correlations and superconductivity

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movie: Ta +Au at MeV (NETSCAPE 4)
movie: central collisions

Near Feshbach resonances it is possible to tune the interaction in ultra-cold Fermi and Bose gases. One can therefore vary the interaction in a Bose-Einstein condensate (BEC) or drive a Fermi gas through a transition from Cooper pairs in a BCS state to two-particle bound states which can also form a BEC. The main interest of the group lies on the conditions for the formation of bound states, Cooper pairs or a BEC. Especially the dependence of these conditions on the interaction is investigated. Calculations are done mainly analytically with a many-body Green functions technique for idealized potentials. Therefore also medium effects such as Bose enhancement and Pauli repulsion can be included.