Quantum dynamics of the square-lattice Heisenberg model

  title={Quantum dynamics of the square-lattice Heisenberg model},
  author={R. Verresen and F. Pollmann and Roderich Moessner},
  journal={Physical Review B},
Despite nearly a century of study of the $S=1/2$ Heisenberg model on the square lattice, there is still disagreement on the nature of its high-energy excitations. By tuning toward the Heisenberg model from the exactly soluble Ising limit, we find that the strongly attractive magnon interactions of the latter naturally account for a number of spectral features of the Heisenberg model. This claim is backed up both numerically and analytically. Using the density matrix renormalization group method… 
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