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.
Single-site entanglement at the superconductor-insulator transition in the Hirsch model / A. Anfossi; C. Degli Esposti Boschi; A. Montorsi; F. Ortolani. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 73:(2006), pp. 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.
