Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 49: Stark korrelierte atomare Systeme

Q 49.1: Talk

Tuesday, March 8, 2005, 17:00–17:15, HU Kinosaal

Pairing and transport properties in 1D Bose-Fermi and Fermi-Fermi Mixtures — •Felix Schmitt, Markus Hild, and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt

We investigate the phase diagram of atomic boson-fermion and fermion-fermion mixtures in an one dimensional optical lattice at zero temperature within the Bose-Fermi and Fermi-Fermi-Hubbard model. In order to allow for the description of strongly correlated states and quantum phase transitions we solve the large scale eigenvalue problem exactly using a Lanczos algorithm. Observables, e.g., one-body and two-body density matrices in coordinate as well as in momentum space are analysed with the aim to identify signatures of different quantum phases and to establish an heuristic understanding of pairing. Furthermore, transport properties are characterised via the rigidity of the system under phase twists (Drude weight) providing a distinction between conducting or superfluid and insulating phases. Together, these quantities reveal a detailed picture of pairing properties and the structure of the phase diagram for this new class of strongly correlated quantum systems.