T= 0 phase diagram of 1D extended anisotropic spin-½ Heisenberg model

The phase diagram of the anisotropic Spin-1 Heisenberg Chain

Phase diagram of the spin - 12 J 1 - J 2 Heisenberg model on a honeycomb lattice

Shou-Shu Gong,1 D. N. Sheng,1 Olexei I. Motrunich,2 and Matthew P. A. Fisher3 1Department of Physics and Astronomy, California State University, Northridge, California 91330, USA 2Department of Physics, California Institute of Technology, Pasadena, California 91125, USA 3Department of Physics, University of California, Santa Barbara, California 93106-9530, USA (Received 3 July 2013; published 2...

Phase Diagram of the 1D t-J Model

We study the ground state properties of the one-dimensional t-J model using the Density Matrix Renormalization Group (DMRG), obtaining its phase diagram. By measuring the energy and correlations functions we have identified four different phases: metal, spin-gap with singlet superconductivity, superconductivity without spin-gap, and phase separation. We found at low densities that the phase sep...

Ergodicity of the extended anisotropic 1D Heisenberg model: response at low temperatures

We present the results of exact diagonalization calculations of the isolated and isothermal on-site static susceptibilities in the anisotropic extended Heisenberg model on a linear chain with periodic boundary conditions. Based on the ergodicity considerations we conclude that the isothermal susceptibility will diverge as T → 0 both in finite clusters and in the bulk system in two non-ergodic r...

Plaquette Ordered Phase and Quantum Phase Diagram in the Spin-2 J1-J2 Square Heisenberg Model

in the Spin-2 J1-J2 Square Heisenberg Model Shou-Shu Gong, Wei Zhu, D. N. Sheng, Olexei I. Motrunich, and Matthew P. A. Fisher Department of Physics and Astronomy, California State University, Northridge, California 91330, USA Department of Physics, California Institute of Technology, Pasadena, California 91125, USA Department of Physics, University of California, Santa Barbara, California 9310...