Real-time dynamics at finite temperature by DMRG: A path-integral approach
arXiv:cond-mat/0504091 · doi:10.1103/PhysRevB.71.241101
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 -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.
5 pages, 4 figures