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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.21: Poster

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

Accurate Determination of the Gauss-Transition in the Anisotropic Spin-One Chain — •Shijie Hu^1,2, Bruce Normand², and Xiaoqun Wang² — ¹Institut für Theoretische Physik, Universität Göttingen — ²Department of Physics, Renmin University of China

We have investigated ground-state properties and thermodynamic properties of the uniaxial anisotropic spin-one Heisenberg chain using the density matrix renormalization group method and the transfer matrix renormalization group method. We found that the gap depending on D around the Ising critical point D_c1=−0.3145(1) is well described by a linear function. By contrast, the critical point D_c2=0.9684(2) cannot easily be obtained by any physical quantities except for the entanglement entropy. Simultaneously x-axis string order parameter which is used to define the Haldane phase with an incomplete Z₂ × Z₂ symmetry and the scaling behavior of the spin susceptibility at low temperature are also exhibited.