Cooper pair dispersion relation for weak to strong coupling

Linear to quadratic crossover of Cooper-pair dispersion relation

Cooper pairing in two (2D) and three (3D) dimensions is analyzed with a set of renormalized equations to determine its binding energy for any fermion number density and all coupling assuming a (possibly singular) pairwise residual inter-fermion interaction. Cooper pairs (CPs) with non-zero center-of-mass momentum (CMM)—usually neglected in BCS theory—are also considered and their binding energy...

Pair breaking in strong-coupling superconductors

The Charge Ordered State from Weak to Strong Coupling

We apply the Dynamical Mean Field Theory to the problem of charge ordering. In the normal state as well as in the Charge Ordered (CO) state the existence of polarons, i.e. electrons strongly coupled to local lattice deformation, is associated to the qualitative properties of the Lattice Polarization Distribution Function (LPDF). At intermediate and strong coupling a CO state characterized by a ...

From weak- to strong-coupling mesoscopic Fermi liquids

We study mesoscopic fluctuations in a system in which there is a continuous connection between two distinct Fermi liquids, asking whether the mesoscopic variation in the two limits is correlated. The particular system studied is an Anderson impurity coupled to a finite mesoscopic reservoir described by the random matrix theory, a structure which can be realized using quantum dots. We use the sl...

Domain walls in supersymmetric QCD: from weak to strong coupling

We consider domain walls that appear in supersymmetric QCD with Nf , Nc massive flavors. In particular, for 2Nf , Nc we explicitly construct the domain walls that interpolate between vacua labeled by i and i 1 Nf . We show that these solutions are Bogomol’nyi-Prasad-Sommerfield saturated for any value of the mass of the matter fields. This fact allows us to evaluate the large mass limit of thes...