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

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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.
5 pages, 4 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/26134

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0504091
 http://arxiv.org/abs/cond-mat/0504091
 Phys. Rev. B 71, 241101(R) (2005)
 doi:10.1103/PhysRevB.71.241101

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arXiv