Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-19
Phys. Rev. Lett. 96, 100603 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1103/PhysRevLett.96.100603
We present exact diagonalization and density matrix renormalization group results for the entanglement entropy of critical spin-1/2 XXZ chains. We find that open boundary conditions induce an alternating term in both the energy density and the entanglement entropy which are approximately proportional, decaying away from the boundary with a power-law. The power varies with anisotropy along the XXZ critical line and is corrected by a logarithmic factor, which we calculate analytically, at the isotropic point. A heuristic resonating valence bond explanation is suggested.
Affleck Ian
Chang Ming-Shyang
Laflorencie Nicolas
Sorensen Erik S.
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