On the BCS-BEC Crossover in the Spin-Polarized Attractive Hubbard Model at T=0
A. Kujawa-Cichy
Solid State Theory Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 PoznaƄ, Poland
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The influence of the Zeeman magnetic field (h) on the ground state evolution of superfluid properties from the weak coupling (BCS-like) to the strong coupling limit of tightly bound local pairs with increasing attraction has been studied. The analysis was carried out within the spin-polarized attractive Hubbard model, for a fixed number of particles and a d = 3 simple cubic lattice. The broken symmetry Hartree approximation was used. For strong attraction and in the dilute limit, the homogeneous magnetized superconducting phase (SCM) was found in the h-|U| and P-|U| diagrams.
DOI: 10.12693/APhysPolA.118.423
PACS numbers: 71.10.Fd, 74.20.Rp, 71.27.+a, 71.10.Hf