Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 52: CE: Low-dimensional Systems - Models 1

TT 52.1: Talk

Thursday, March 17, 2011, 14:00–14:15, HSZ 105

Spectral functions with the DMRG in frequency space — •Piet Dargel and Thomas Pruschke — Institut für theoretische Physik, Universität Göttingen, Deutschland

Standard methods for calculating spectral functions with the DMRG in frequency space have to include an artificial broadening (Correction vector) or will have bad resolution for low energies (Fourier transform of TDMRG data). We use an adaptive Lanczos method to calculate iteratively the coefficients of the continued fraction expansion of the spectral function. We show that the spectral weights and poles for the discrete system can be extracted by this method and compare this method to other DMRG methods for calculating spectral functions in frequency space.