Universal entanglement entropy in 2D conformal quantum critical points

Details Universal entanglement entropy in 2D conformal quantum critical points Universal entanglement entropy in 2D conformal quantum critical points

2008-12-01

arxiv.org/abs/0812.0203v2

Phys. Rev. B 79, 115421 (2009)

Physics

Condensed Matter

Statistical Mechanics

14 pages, 3 figures, v2 references updated, minor changes

Scientific paper

10.1103/PhysRevB.79.115421

We study the scaling behavior of the entanglement entropy of two dimensional conformal quantum critical systems, i.e. systems with scale invariant wave functions. They include two-dimensional generalized quantum dimer models on bipartite lattices and quantum loop models, as well as the quantum Lifshitz model and related gauge theories. We show that, under quite general conditions, the entanglement entropy of a large and simply connected sub-system of an infinite system with a smooth boundary has a universal finite contribution, as well as scale-invariant terms for special geometries. The universal finite contribution to the entanglement entropy is computable in terms of the properties of the conformal structure of the wave function of these quantum critical systems. The calculation of the universal term reduces to a problem in boundary conformal field theory.

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