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Phase diagram of quantum dissipative junctions
T. Strohm, F. Guinea
Mesoscopic capacitances, in the quantum regime, are described as a quantum rotor coupled to a dissipative bath. We analyze the phase diagram of this model, as function of the capac…
The wavefunction renormalization constant for the one- and two- band Hubbard hamiltonians in two dimensions
E. Louis, G. Chiappe, J. Galan +2
The wavefunction renormalization in the Hubbard model is studied, by using well tested mean field tecniques. The 'orthogonality catastrophe' is shown to exist, even in 2D, for dopi…
Hartree Fock and RPA studies of the Hubbard model
F. Guinea, E. Louis, J. A. Verges
The applicability of the Hartree-Fock and random phase approximations to models of strongly correlated electrons is discussed. The 2D Hubbard model is analyzed. An antiferromagneti…
Flux flow dissipation in superconductors with short coherence length
F. Guinea, Yu. Pogorelov
In superconductors where the coherence length is comparable to the Fermi wavelength, the electronic levels within a vortex core are quantized, and separated by energies of the orde…
Low voltage conductance of small tunnel junctions
F. Guinea, M. Ueda
A discrete charge transfer in a small tunnel junction where Coulomb interactions are important can excite electron-hole pairs near the Fermi level. We use a simple model to study t…