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2007 | 111 | 5 | 745-752
Article title

The BCS-BEC Crossover and Superconductivity in a Lattice Fermion Model with Hard Core Repulsion

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We considered the BCS-BEC crossover at T=0 in the framework of a lattice fermion model (the extended Hubbard model). We analyzed the case of on-site hard core repulsion (U=∞) and intersite attraction (W<0) in a 3D system with extended s-wave pairing symmetry. The mechanisms of density-driven and attraction-strength-driven crossover were analyzed. We obtained the ground state phase diagram. The analyzed quantities are: chemical potential, order parameter, coherence length, and fraction of condensed particles.
  • Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
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