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

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.
PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
A. Anfossi; C. Degli Esposti Boschi; A. Montorsi; F. Ortolani
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/25514
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