Single-site entanglement at superconductor-insulator transition in the Hirsch model

Details Single-site entanglement at superconductor-insulator transition in the Hirsch model Single-site entanglement at superconductor-insulator transition in the Hirsch model

2005-03-24

arxiv.org/abs/cond-mat/0503600v3

Phys. Rev B 73, 085113 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures

Scientific paper

10.1103/PhysRevB.73.085113

We investigate the transition to the insulating state in the one-dimensional Hubbard model with bond-charge interaction x (Hirsch model), at half-filling and T=0. 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 u_c(x) for x>0.5. The region 0x_c.

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