Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: CE: Low-dimensional Systems - Models 1
TT 30.1: Talk
Thursday, March 25, 2010, 09:30–09:45, H20
Cluster Spin-DMFT for Quantum Spin Ladders — •Mukul Laad1,2 and Kai Philliph Schmidt2 — 1Institut für Theoretische Physik, RWTH Aachen D-52056, Aachen, Germany — 2Lehrstuhl für Theoretische Physik I, Otto-Hahn-Strasse 4, TU Dortmund, 44221 Dortmund, Germany
We introduce a new cluster-DMFT scheme for quantum spin models, with a view to accessing short-ranged dynamical spin correlations underlying spin liquid behavior in low-dimensional frustrated systems. Here, we present concrete results for spin S=1/2 two-leg ladder systems, with and without additional frustrating interactions. These show valence-bond-solid ground (VBS) states with rich excitation spectra consisting of elementary triplons, two-triplon bound states, and multi-particle scattering continuua. A wealth of earlier theoretical results allow us to benchmark cluster spin-DMFT.