Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Postersession Matter at Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-Cold Atoms
TT 34.7: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Spectral functions in one-dimensional quantum systems at T>0 — •Thomas Barthel1, Ulrich Schollwöck1, and Steve R. White2 — 1Institute for Theoretical Physics C, RWTH Aachen — 2Department of Physics and Astronomy, University of California, Irvine, USA
We demonstrate how a combination of finite-temperature time-dependent density-matrix renormalization-group (t-DMRG) calculations and time-series prediction allows for an easy and very accurate calculation of spectral functions in 1d quantum systems, irrespective of their statistics, for arbitrary temperatures.
This is illustrated with spin structure factors of XX and XXZ spin-1/2 chains where we compare, in the first case, against an exact solution and, in the second case, against Bethe ansatz (BA) at T=0 and Quantum Monte Carlo (QMC) for T>0. [arXiv:0901.2342]