Details

Autor(en) / Beteiligte

• Iskin, M
• Sá de Melo, C A R

Titel

Two-species fermion mixtures with population imbalance

Ist Teil von

• Physical review letters, 2006-09, Vol.97 (10), p.100404-100404, Article 100404

Ort / Verlag

United States

Erscheinungsjahr

2006

Quelle

American Physical Society

Beschreibungen/Notizen

• We analyze the phase diagram of uniform superfluidity for two-species fermion mixtures from the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation (BEC) limit as a function of the scattering parameter and population imbalance. We find at zero temperature that the phase diagram of population imbalance versus scattering parameter is asymmetric for unequal masses, having a larger stability region for uniform superfluidity when the lighter fermions are in excess. In addition, we find topological quantum phase transitions associated with the disappearance or appearance of momentum space regions of zero quasiparticle energies. Lastly, near the critical temperature, we derive the Ginzburg-Landau equation and show that it describes a dilute mixture of composite bosons and unpaired fermions in the BEC limit.