Phase Transitions in Quasi-One-Dimensional System with Unconventional Superconductivity
Andrzej Ptok, Agnieszka Cichy, Karen Rodríguez +1 more
The paper is devoted to a study of superconducting properties of population-imbalanced fermionic mixtures in quasi -one-dimensional optical lattices. The system can be effectively described by the attractive Hubbard model with the Zeeman magnetic field term. We investigated the ground-state phase diagram of the model as a function of the chemical potential and the magnetic field. The ground state of the system exhibits the conventional BCS-type superconductivity as well as the unconventional so-called Fulde-Ferrell-Larkin-Ovchinnikov state, in which the total momentum of Cooper pairs is non-zero. We determine the orders of transitions as well as the behavior of order parameters with a change of the model parameters.
arXiv:1710.01668•Journal of Superconductivity and Novel Magnetism•Oct 3, 2017•8 citations