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Real-time dynamics at finite temperature by DMRG: A path-integral approach | | J. Sirker
; A. Klümper
; | | Date: |
5 Apr 2005 | | Journal: | Phys. Rev. B 71, 241101(R) (2005) DOI: 10.1103/PhysRevB.71.241101 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | 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. | | Source: | arXiv, cond-mat/0504091 | | Services: | Forum | Review | PDF | Favorites | |
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