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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.70: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Quantum phase transitions in anisotropic Heisenberg antiferromagnetic chains — •David Peters — Institut für Theoretische Physik der Phasenübergänge, RWTH Aachen

Using (infinite) density matrix renormalization group calculations, ground state properties of the spin–1 Heisenberg chain with exchange and quadratic single-ion anisotropies in an external field are studied, for special choices of the two kinds of anisotropies[1]. In particular, the ground state phase diagrams comprise antiferromagnetic, spin-liquid (or spin-flop), half-magnetization-plateau, and supersolid (or biconical) phases. Especially, studying various quantities, including spin-spin correlations, interesting features of the spin-liquid and supersolid phases are identified. Properties of the quantum chains are compared to those of corresponding classical spin chains.
D. Peters, I.P. McCulloch, W. Selke, Phys. Rev. B 79, 132406 (2009); J. Phys.: Conf. Ser. 200, 022046 (2010)