Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 65: Low-Dimensional Systems: 1D – Theory
TT 65.11: Talk
Wednesday, March 18, 2015, 18:00–18:15, H 0104
Minimally entangled typical thermal states and matrix product purifications for the simulation of strongly-correlated quantum systems at T>0 — Moritz Binder1 and •Thomas Barthel2 — 1LMU München — 2LPTMS, Université Paris-Sud and CNRS
We describe different approaches for the study of equilibrium states and finite-temperature response functions of strongly-correlated quantum many-body systems in the framework of the density matrix renormalization group (DMRG). One is based on matrix product purifications. An alternative are so-called minimally entangled typical thermal states (METTS) which combine DMRG with sampling. We compare and explain the efficiencies of these methods and new variants using the spin-1/2 XXZ chain and the 1D Bose-Hubbard model as examples.