We investigate the transition to the insulating state in the one-dimensional Hubbard model with bond-charge interaction. By means of the density-matrix renormalization group algorithm the charge gap closure is examined by both standard finite-size scaling analysis and looking at singularities in the derivatives of single-site entanglement. The results of the two techniques show that a quantum phase transition takes place at a finite Coulomb interaction.
A. Anfossi, C. Degli Esposti Boschi, A. Montorsi, F. Ortolani (2006). Single-site entanglement at the superconductor-insulator transition in the Hirsch model. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 73, 085113-1-085113-5 [10.1103/PhysRevB.73.085113].
Single-site entanglement at the superconductor-insulator transition in the Hirsch model
DEGLI ESPOSTI BOSCHI, CRISTIAN;ORTOLANI, FABIO
2006
Abstract
We investigate the transition to the insulating state in the one-dimensional Hubbard model with bond-charge interaction. By means of the density-matrix renormalization group algorithm the charge gap closure is examined by both standard finite-size scaling analysis and looking at singularities in the derivatives of single-site entanglement. The results of the two techniques show that a quantum phase transition takes place at a finite Coulomb interaction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
