Spin-supersolid phase in Heisenberg chains: a characterization via   Matrix Product States with periodic boundary conditions
  By means of a variational calculation using Matrix Product States with periodic boundary conditions, we accurately determine the extension of the spin-supersolid phase predicted to exist in the spin-1 anisotropic Heisenberg chain. We compute both the structure factor and the superfluid stiffness, and extract the critical exponents of the supersolid-to-solid phase transition. 
Davide Rossini, Vittorio Giovannetti, Rosario Fazio
cond-mat.str-el quant-ph