Phase transitions in quasi-one dimensional system with unconventional superconductivity

Abstract

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.

6 pages, 4 figures; submitted to Journal of Superconductivity and Novel Magnetism

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Cited by in corpus (5)

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• Lifshitz transitions in multi-band Hubbard models for topological superconductivity in complex quantum matter
• Phase separations induced by a trapping potential in one-dimensional fermionic systems as a source of core-shell structures
• Unconventional pairing in few-fermion systems at finite temperature
• Spin-polarized superconducting phase in semiconducting system with next-nearest-neighbor hopping on the honeycomb lattice