Effective vacuum interaction in the Shubin-Vonsovsky model with Hubbard on-site repulsion U and additional Coulomb repulsion V at neighboring sites.
Qualitative phase-diagram of the Shubin-Vonsovsky model in the strong coupling case. For n el = 1, an AFM state appears in the model, while for n el = 1/2 we have a checkerboard CO state. We have also extended regions of phase-separation close to n el = 1/ 2 and n el = 1.
A phase-separated state for densities 1/2 − δ c < n el < 1/2 with nano-scale metallic clusters inside a CO checkerboard insulating matrix for V ≫ t.
Polarization dependence of Tc in 3D case.
Polarization dependence of Tc in 2D case.
H-T diagram for 2D electron gas in parallel magnetic field.
Tc as a function of relative filling in the two band model.
The leading contribution to the effective interaction Veff for the p-wave pairing of heavy particles via polarization of light particles. The open circles stand for the vacuum T-matrix ThL , which in Born case coincides with interband Hubbard interaction UhL .
The lowest order skeleton diagram for EPE in the self consistent T-matrix approximation. ThL sub stands for the T-matrix in matter.
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