The Lanczos algorithm has been applied to the Hubbard model on a 4 X 4 square lattice and several equal-time correlation functions have been evaluated. This computation has been made possible by a classification of all the irreducible representations of the space symmetry group, which allowed a considerable reduction of the dimension of the Hilbert space of the system. Such an analysis is quite general and might be useful in other physical applications. Our results shed light on the effects of doping on the magnetic ordering, suggest a spin-charge decoupling at large U, and show a remarkable reduction of the quasiparticle weight at strong coupling.

The Lanczos algorithm has been applied to the Hubbard model on a 4×4 square lattice and several equal-time correlation functions have been evaluated. This computation has been made possible by a classification of all the irreducible representations of the space symmetry group, which allowed a considerable reduction of the dimension of the Hilbert space of the system. Such an analysis is quite general and might be useful in other physical applications. Our results shed light on the effects of doping on the magnetic ordering, suggest a spin-charge decoupling at large U, and show a remarkable reduction of the quasiparticle weight at strong coupling. © 1992 The American Physical Society.

ELECTRON CORRELATIONS IN THE 2-DIMENSIONAL HUBBARD-MODEL - A GROUP-THEORETICAL AND NUMERICAL STUDY

PAROLA, ALBERTO
1992-01-01

Abstract

The Lanczos algorithm has been applied to the Hubbard model on a 4×4 square lattice and several equal-time correlation functions have been evaluated. This computation has been made possible by a classification of all the irreducible representations of the space symmetry group, which allowed a considerable reduction of the dimension of the Hilbert space of the system. Such an analysis is quite general and might be useful in other physical applications. Our results shed light on the effects of doping on the magnetic ordering, suggest a spin-charge decoupling at large U, and show a remarkable reduction of the quasiparticle weight at strong coupling. © 1992 The American Physical Society.
1992
Fano, G; Ortolani, F; Parola, Alberto
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/6404
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 56
  • ???jsp.display-item.citation.isi??? 55
social impact