Tuning between singlet, triplet, and mixed pairing states in an extended Hubbard chain
Tuning between singlet, triplet, and mixed pairing states in an extended Hubbard chain
We study spin-half fermions in a one-dimensional extended Hubbard chain at low filling. We identify three triplet and one singlet pairing channels in the system, which are independently tunable as a function of nearest-neighbor charge and spin interactions. In a large-size system with translational invariance, we derive gap equations for …