2009/07/23 by Philippe Sindzingre, Nic Shannon, Tsutomu Momoi · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/1742-6596/200/2/022058
submitted for the International Conference on Magnetism to be held 26-31 July 2009 in Karlsruhe
arxiv created 2009/07/23 · arxiv updated 2015/05/13
We presents the results of an extensive numerical study of the phase diagram of the spin-1/2, \protectJ1-J2-J3 Heisenberg model on a square lattice, for both ferromagnetic and antiferromagnetic nearest-neighbor interactions J1, using exact diagonalization with periodic and twisted boundary conditions. Comparison is made with published spin wave calculations. We show that quantum fluctuations play a very important role, changing both the extent and the wave vector of classical spiral phases, and leading to new quantum phases where the classical spiral states have a high degeneracy. These include a new phase with small or vanishing spin-stiffness, in addition to known valence-bond-solid and bond-nematic phases.