Physics – Quantum Physics
Scientific paper
2005-11-10
S. S. Deng, S. J. Gu, and H. Q. Lin, Phys. Rev. B 74, 045103 (2006).
Physics
Quantum Physics
8 pages, 9 figures
Scientific paper
10.1103/PhysRevB.74.045103
In this paper, we study block-block entanglement in the ground state of one-dimensional extended Hubbard model. Our results show that the phase diagram derived from the block-block entanglement manifests richer structure than that of the local (single site) entanglement because it comprises nonlocal correlation. Besides phases characterized by the charge-density-wave, the spin-density-wave, and phase-separation, which can be sketched out by the local entanglement, singlet superconductivity phase could be identified on the contour map of the block-block entanglement. Scaling analysis shows that ${\rm log}_2(l)$ behavior of the block-block entanglement may exist in both non-critical and the critical regions, while some local extremum are induced by the finite-size effect. We also study the block-block entanglement defined in the momentum space and discuss its relation to the phase transition from singlet superconducting state to the charge-density-wave state.
Deng Shu-Sa
Gu Shi-Jian
Lin Hai-Qing
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