Details

Autor(en) / Beteiligte

• Mannarelli, Massimo
• Nardulli, Giuseppe
• Ruggieri, Marco

Titel

Evaluating the phase diagram of superconductors with asymmetric spin populations

Ist Teil von

• Physical review. A, Atomic, molecular, and optical physics, 2006-09, Vol.74 (3), Article 033606

Ort / Verlag

United States

Erscheinungsjahr

2006

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• The phase diagram of a nonrelativistic fermionic system with imbalanced state populations interacting via a short-range S-wave attractive interaction is analyzed in the mean-field approximation. We determine the energetically favored state for different values of the mismatch between the two Fermi spheres in the weak- and strong-coupling regimes considering both homogeneous and nonhomogeneous superconductive states. We find that the homogeneous superconductive phase persists for values of the population imbalance that increase with increasing coupling strength. In the strong-coupling regime and for large population differences the energetically stable homogeneous phase is characterized by one gapless mode. We also find that the inhomogeneous superconductive phase characterized by the condensate {delta}(x){approx}{delta} exp(iq{center_dot}x) is energetically favored in a range of values of the chemical-potential mismatch that shrinks to zero in the strong-coupling regime.