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DY: Fachverband Dynamik und Statistische Physik

DY 42: Coherent Quantum Dynamics (joint session DY/TT)

DY 42.8: Vortrag

Donnerstag, 23. März 2017, 11:45–12:00, ZEU 160

iDMRG Study of the Kitaev-Heisenberg Model — •Matthias Gohlke, Ruben Verresen, Frank Pollmann, and Roderich Moessner — MPI-PKS, Dresden, Germany

Quantum spin-liquids represent novel phases of matter that host emergent fractionalized excitations. The Kitaev-Heisenberg model is a two-dimensional model system in this context and relevant for recent experiments on putative quantum spin-liquid materials. We revisit the ground state phase diagram of the Kitaev-Heisenberg model using large scale infinite density-matrix renormalization group method of cylinders with up to twelve sites circumference. In particular, the cylindrical geometry allows to capture the gapless points and to extract its universal critical properties. Furthermore, we observe that the gapless excitations remain stable under perturbation with Heisenberg interaction.