Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-02-06
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 7 figures
Scientific paper
In this paper, we study the role of both "spin"(species) and mass imbalance in a mixture of two species of fermionic atoms with attractive interaction in an one-dimensional optical lattice. Using the bosonization approach, quantum phase transitions between a liquid phase and phase separated states are studied under various conditions of interaction, spin imbalance, and mass imbalance. We find that, in the phase-separated region, there exists two kinds of phase separation and a special quantum phase transition might exist between them in the large $U$ limit. On the other hand, the singlet superconducting correlation dominates in the liquid phase. The pairing behavior has been also demonstrated that there is oscillating behavior in real space. We find both the spin and mass imbalance are in favor of the formation of Fulde-Ferrell-Larkin-Ovchinnikov state.
Gu Shi-Jian
Lin Hai-Qing
Lu Wen-Long
Wang Zhi-Guo
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