Ground-State Dynamical Correlation Functions: An Approach from Density Matrix Renormalization Group Method

Details Ground-State Dynamical Correlation Functions: An Approach from Density Matrix Renormalization Group Method Ground-State Dynamical Correlation Functions: An Approach from Density Matrix Renormalization Group Method

1995-02-22

arxiv.org/abs/cond-mat/9502091v1

Physics

Condensed Matter

11 pages, latex, 4 figures

Scientific paper

10.1103/PhysRevB.53.5086

A numerical approach to ground-state dynamical correlation functions from Density Matrix Renormalization Group (DMRG) is developed. Using sum rules, moments of a dynamic correlation function can be calculated with DMRG, and with the moments the dynamic correlation function can be obtained by the maximum entropy method. We apply this method to one-dimensional spinless fermion system, which can be converted to the spin 1/2 Heisenberg model in a special case. The dynamical density-density correlation function is obtained.

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