Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 2: Poster Quantengase
Q 2.19: Poster
Freitag, 4. März 2005, 11:00–12:30, Poster HU
Atomic Fermi gases in the trimerized Kagomé lattice at 2/3 filling — •Henning Fehrmann1, Bogdan Damski1,2, Andreas Honecker3, Luis Santos4, Hans-Ulrich Everts1, and Maciej Lewenstein1 — 1Institut für Theoretische Physik, Universität Hannover — 2Instytut Fizyki, Uniwersytet Jagielloński — 3Institut für Theoretische Physik, Technische Universität Braunschweig — 4Institut für Theoretische Physik III, Universität Stuttgart
We study the low temperature properties of an atomic spinless interacting Fermi gas in the trimerized Kagomé for the case of two fermions per trimer. The system is described by by a quantum spin 1/2 model on the triangular lattice with couplings that depend on bonds directions. Using exact diagonalizations we show that the system exhibits non-standard properties of a quantum spin liquid crystal, combining a planar antiferromagnetic order with extravagantly large number of low energy excitations.