Dynamical dimer-dimer correlation functions from exact diagonalization

Details Dynamical dimer-dimer correlation functions from exact diagonalization Dynamical dimer-dimer correlation functions from exact diagonalization

2000-06-09

arxiv.org/abs/cond-mat/0006168v1

Phys. Rev. B 63, 174416 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages revtex, 10 figures

Scientific paper

10.1103/PhysRevB.63.174416

A regularization method is presented to deduce dynamic correlation functions from exact diagonalization calculations. It is applied to dimer-dimer correlation functions in quantum spin chains relevant for the description of spin-Peierls systems. Exact results for the XY model are presented. The analysis draws into doubt that the dimer-dimer correlation functions show the same scale invariance as spin-spin correlation functions. The results are applied to describe the quasi-elastic scattering in CuGeO$_3$.

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