Spin-1 Heisenberg antiferromagnetic chain with exchange and single-ion anisotropies

Peters, D., McCulloch, I.P.(2), Selke, W.
Institut für Theoretische Physik, Technische Hochschule Aachen,
D-52056 Aachen, Germany and (2) Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia


Using density matrix renormalization group calculations, ground state properties of the spin-1 Heisenberg chain with exchange and single--ion anisotropies in an external field are studied. Our findings confirm and refine recent results by Sengupta and Batista, Physical Review Letters 98, 227201 (2007), on the same model applying Monte Carlo techniques. In particular, we present evidence for two types of biconical (or supersolid) and for two types of spin--flop (or superfluid) structures. Basic features of the quantum phase diagram may be interpreted qualitatively in the framework of classical spin models.