Condensed Matter Physics, 2009, vol. 12, No. 3, pp. 497-506

Title: Properties of the two-dimensional spin-1/2 Heisenberg model on a honeycomb lattice with interlayer coupling
  U. Löw (Theoretische Physik II, Technische Universität Dortmund, 44227 Dortmund, Germany)

The magnetic properties of the two-dimensional S=1/2 (quantum) antiferromagnetic Heisenberg model on a honeycomb lattice with and without interlayer coupling are studied by means of a continuous Euclidean time Quantum Monte-Carlo algorithm. The internal energy, the magnetic susceptibility and the staggered magnetization are determined in the full temperature range. For the two-dimensional system the ground-state energy/bond is found to be E0hc=-0.36303(13), and the zero temperature staggered magnetization mst=0.2681(8). For coupled planes of honeycomb systems a phase transition from an ordered phase to a disordered phase is found at T/J=0.695(10).

Key words: quantum Heisenberg antiferromagnetic, honeycomb lattice, interlayer coupling
PACS: 71.70.Ch, 61.72.Yx, 64.60.Cn
Comments: Figs. 8, Refs. 30, Tabs. 0

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