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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.50: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Entanglement entropy and quantum phase transition — •Alex Cojuhovschi and Eric Jeckelmann — Leibniz Universitaet Hannover, Germany

We study the bipartite entanglement entropy in the one-dimensional half-filled extended Hubbard model with nearest neighbor repulsion. The entropy is calculated in finite open chains using the density-matrix renormalization group method and in infinite systems using the matrix-product state proposed by Vidal. We discuss the phase diagram of this model, in particular the possible existence of a spontaneous long-range order of the bond-order wave type (dimerization), the behavior of the bipartite entropy at the quantum phase boundaries, and the performance of Vidal's infinite-system method.