TY  - JOUR
A1  - Barthel, Thomas
A1  - Schollwock, Ulrich
A1  - White, Steven R.
T1  - Spectral functions in one-dimensional quantum systems at finite temperature using the density matrix renormalization group
N2  - We present 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.
Y1  - 2009
UR  - http://prb.aps.org/
U6  - https://doi.org/10.1103/Physrevb.79.245101
SN  - 1098-0121
ER  -