Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.80: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Ground state properties of antiferromatgnetic anisotropic S=1 Heisenberg spin chains — •David Peters — Institut für Theoretische Physik, RWTH Aachen, 52064 Aachen

Using (infinite) density matrix renormalization group techniques, ground state properties of antiferromagnetic S=1 Heisenberg spin chains with exchange and single--site anisotropies in an external field are studied. The phase diagram is known to display a plenitude of interesting phases. We elucidate quantum phase transitions between the supersolid and spin--liquid as well as the spin--liquid and the ferromagnetic phases. Analyzing spin correlation functions in the spin--liquid phase, commensurate and (two distinct) incommensurate regions are identified.