Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.79: Poster
Mittwoch, 24. März 2010, 14:00–18:00, Poster D1
DMRG calculations for S=1 anisotropic Heisenberg antiferromagnetic chains — •David Peters1, Ian P. McCulloch2, and Walter Selke1 — 1JARA-SIM and RWTH Aachen, Institut für Theoretische Physik, Germany — 2University of Queensland, Department of Physics, Brisbane, Australia
Using density matrix renormalization group calculations, for finite number of sites and in the thermodynamic limit, ground state properties of spin--1 Heisenberg chains with exchange and quadratic single-ion anisotropies in an external field are studied, for special choices of the two kinds of anisotropies [1,2]. In particular, the phase diagram includes antiferromagnetic, spin-liquid (or spin-flop), half magnetization plateau, and supersolid (or biconical) phases. Especially, generic features of the spin-liquid and supersolid phases as well as corresponding quantum phase transitions are discussed. Properties of the quantum chains are compared to those of corresponding classical spin chains.
Parts of the research has been funded by the excellence initiative of the German federal and state governments.
[1] D. Peters, I. P. McCulloch, W. Selke, Phys. Rev. B79, 132406 (2009); Journal of Physics: Conference Proceedings (in print)
[2] F. Heidrich-Meisner, I. P. McCulloch, A. K. Kolezhuk, Phys. Rev. B80, 144417 (2009)