Real-time dynamics at finite temperature by DMRG: A path-integral approach

2005/04/05 by J. Sirker, A. Klümper
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.71.241101

published as Phys. Rev. B 71, 241101(R) (2005) · 5 pages, 4 figures

arxiv created 2005/04/05 · arxiv updated 2009/12/01

Abstract

We propose a path-integral variant of the DMRG method to calculate real-time correlation functions at arbitrary finite temperatures. To illustrate the method we study the longitudinal autocorrelation function of the XXZ-chain. By comparison with exact results at the free fermion point we show that our method yields accurate results up to a limiting time which is determined by the spectrum of the reduced density matrix.

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