Spectral functions in one-dimensional quantum systems at T>0

Details Spectral functions in one-dimensional quantum systems at T>0 Spectral functions in one-dimensional quantum systems at T>0

2009-01-15

arxiv.org/abs/0901.2342v2

Phys. Rev. B 79, 245101 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 8 figures; added comparison to quantum Monte Carlo, extended discussion of the method, 4 figures added; published ver

Scientific paper

10.1103/PhysRevB.79.245101

We present for the first time time-dependent density-matrix renormalization-group simulations (t-DMRG) at finite temperatures. It is demonstrated how a combination of finite-temperature t-DMRG and time-series prediction allows for an easy and very accurate calculation of spectral functions in one-dimensional quantum systems, irrespective of their statistics, for arbitrary temperatures. This is illustrated with spin structure factors of XX and XXX spin-1/2 chains. For the XX model we can compare against an exact solution and for the XXX model (Heisenberg antiferromagnet) against a Bethe Ansatz solution and quantum Monte Carlo data.

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