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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. White21Institute 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]

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DPG-Physik > DPG-Verhandlungen > 2009 > Dresden