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Статья

Anomalous superconductivity and superfluidity in repulsive fermion systems

Physics-Uspekhi. 2015. Vol. 58. No. 8. P. 733-761.
Kagan M.Yu., Mitskan V., Korovushkiin M.

We discuss the mechanisms of unconventional super-conductivity and superfluidity in 3D and 2D fermionic systems with purely repulsive interaction at low densities.We construct phase diagrams of these systems and find the areas of the superconducting state in free space, as well as on the lattice in the framework of the Fermi-gas model with hard-core repul- sion, the Hubbard model, the Shubin±Vonsovsky model, and the t-J model. We demonstrate that the critical superconducting temperature can be greatly increased in the spin-polarized case or in a two-band situation already at low densities.