Intrinsic dissipative Floquet superconductors beyond mean-field theory

Mean-field theory of strongly disordered superconductors

Qualitative features of the mean-field theory of superconductivity in a strongly disordered system of fermions with short-range attraction are discussed. In this limit the effective theory at low energies is entirely bosonic, and I consider both the artificial infiniterange limit and the more realistic case of ”nearest-neighbor” hopping of bosons between the localized states. In the infinite-ra...

Beyond Gross-Pitaevskii Mean Field Theory

A fully fermionic mean field theory of the cuprate superconductors

We introduce a new mean field approach to the extended tJ model that incorporates both electronlike quasiparticle and spin-charge separated excitations as suggested by experiments and numerical studies. It leads to a mean field phase diagram which is consistent with that of hole and electron doped cuprates. Moreover, it provides a framework to describe the observed evolution of the electron spe...

Remarks on the mean-field theory of strongly disordered superconductors

Qualitative features of the mean-field BCS-like theory of superconductivity in a strongly disordered system of fermions with short-range attraction are discussed. Specifically, I consider two versions of the effective bosonic low-energy theory for the electron pairs: with the infinite range, and with the nearest neighbor hoping between localized states. In the first case the superconducting gap...

In-medium chiral perturbation theory beyond the mean–field approximation

An explicit expression for the generating functional of two–flavor low–energy QCD with external sources in the presence of non-vanishing nucleon densities has been derived recently [1]. Within this approach we derive power counting rules for the calculation of in-medium pion properties. We develop the so-called standard rules for residual nucleon energies of the order of the pion mass and a mod...