BOGOLIUBOV QUASI-PARTICLE EXCITATIONS IN THE NEGATIVE-U HUBBARD-MODEL- A SMALL-CLUSTER STUDY

Authors
OHTA Y NAKAUCHI A EDER R TSUTSUI K MAEKAWA S
Citation
Y. Ohta et al., BOGOLIUBOV QUASI-PARTICLE EXCITATIONS IN THE NEGATIVE-U HUBBARD-MODEL- A SMALL-CLUSTER STUDY, Physica. C, Superconductivity, 235, 1994, pp. 2169-2170
Citations number
11
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
235
Year of publication
1994
Part
4
Pages
2169 - 2170
Database
ISI
SICI code
0921-4534(1994)235:<2169:BQEITN>2.0.ZU;2-0
Abstract
An exact-diagonalization technique on small clusters is used to study excitations and superconductivity in the two-dimensional negative-U Hu bbard model. We calculate the Bogoliubov-quasiparticle spectrum, conde nsation amplitude, and coherence length as a function of the coupling strength (U/t), thereby working out how the picture of Bogoliubov quas iparticles in the BCS superconductors is affected by increasing the at traction U/t.