8 papers
Numerical renormalization group approach to fluctuation exchange in the presence of electron-phonon coupling: Pairing in the Holstein-Hubbard model
C. -H. Pao, H. -B. Schuttler
The fluctuation exchange (FLEX) approximation is applied to study the Holstein-Hubbard model. Due to the retarded nature of the phonon-mediated electron-electron interaction, neith…
d-Wave Pairing in the Presence of Long-Range Coulomb Interactions
G. Esirgen, H. -B. Schüttler, N. E. Bickers
The one-band extended Hubbard model in two dimensions near band-filling 1/2 is solved in the fluctuation exchange approximation, including the long-range (1/r) part of the Coulomb…
Berry phases and pairing symmetry in Holstein-Hubbard polaron systems
K. Yonemitsu, J. Zhong, H. -B. Schuttler
We study the tunneling dynamics of dopant-induced hole polarons which are self-localized by electron-phonon coupling in a two-dimensional antiferro- magnet. Our treatment is based…
Superconducting instability in the Holstein-Hubbard model: A numerical renormalization group study
C. -H. Pao, H. -B. Schüttler
We have studied the d-wave pairing-instability in the two-dimensional Holstein-Hubbard model at the level of a full fluctuation exchange approximation which treats both Coulomb and…
The Isotope Effect in d-Wave Superconductors
H. -B. Schüttler, C. -H. Pao
Based on recently proposed anti-ferromagnetic spin fluctuation exchange models for -superconductors, we show that coupling to harmonic phonons {\it{cannot}} account fo…
Contrasting Dynamic Spin Susceptibility Models and their Relation to High Temperature Superconductivity
H. -B. Schuttler, M. R. Norman
We compare the normal-state resistivities and the critical temperatures for superconducting pairing due to antiferromagnetic (AF) spin fluctuation exchange…