Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: CE: Low-dimensional Systems - Materials 3
TT 35.19: Vortrag
Mittwoch, 16. März 2011, 19:15–19:30, HSZ 301
Four-leg Shastry-Sutherland tubes in a magnetic field — •Gregor Foltin1, Salvatore Manmana2, Frederic Mila3, and Kai Phillip Schmidt1 — 1Lehrstuhl für Theoretische Physik I, TU Dortmund, 44221 Dortmund, Germany — 2JILA, University of Colorado at Boulder, Colorado 80309, USA — 3CTMC, EPF Lausanne, 1015 Lausanne, Switzerland
The origin of the exotic magnetization of the highly frustrated quantum magnet SrCu(BO3)2 is currently not understood. One theoretical challenge is the fact that it is microscopically well described by the so-called two-dimensional Shastry-Sutherland model in a parameter regime close to a quantum critical point. Especially the experimentally most prominent plateau at 1/8 seems to be not stable in the Shastry-Sutherland model at least up to intermediate couplings. The latter finding is obtained by deriving an effective low-energy model using perturbative continuous unitary transformations (pCUTs) which is then solved in the classical approximation (CA).
In this contribution, we focus on quasi-1d versions of the model where the pCUT(+CA) approach can be compared with density matrix renormalization group (DMRG). This has been already done successfully for a two-leg Shastry-Sutherland tube. Interestingly, a novel type of magnetization plateau is found at 1/5 consisting of bound states of triplons with different quantum numbers. Here we want to extend this work by studying a Shastry-Sutherland tube with four orthogonal dimer chains. To this end results from pCUT(+CA) and DMRG are compared.