Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study*
Wei Xing-Bo, Meng Ye-Ming, Wu Zhe-Ming, Gao Xian-Long
       
The density distributions (the full circle for n i ↑, the cross for n i ↓, and the full circle for Δ n i ) for the three different phases of potential imbalance γ = 4 in Fig.  1 . (a) The density distribution with u = −1.8 for the FFLO phase of two peaks (FP-FFLO2). (b) The momentum pair distributions for case (a) in the center at i = 35–64. The inset shows the magnified peak. (c) The density distribution with u = −2.4 for the NP phase. (d) The density distribution with u = −3.0 for the BCS phase.