Real-time dynamics at finite temperature by DMRG: A path-integral approach
Sirker, J. · Klümper, A.
Original · EN
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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