Exact spectra, spin susceptibilities and order parameter of the quantum Heisenberg antiferromagnet on the triangular lattice

Abstract

Exact spectra of periodic samples are computed up to $N=36$. Evidence of an extensive set of low lying levels, lower than the softest magnons, is exhibited. These low lying quantum states are degenerated in the thermodynamic limit; their symmetries and dynamics as well as their finite-size scaling are strong arguments in favor of Néel order. It is shown that the Néel order parameter agrees with first-order spin-wave calculations. A simple explanation of the low energy dynamics is given as well as the numerical determinations of the energies, order parameter and spin susceptibilities of the studied samples. It is shown how suitable boundary conditions, which do not frustrate Néel order, allow the study of samples with $N=3p+1$ spins. A thorough study of these situations is done in parallel with the more conventional case $N=3p$.

36 pages, REVTeX 3.0, 13 figures available upon request, LPTL preprint

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• Finite size and temperature effects in the AF Heisenberg model
• Universal Magnetic Properties of Frustrated Quantum Antiferromagnets in Two Dimensions
• Possible Quantum Spin Liquid States on the Triangular and Kagome Lattices
• The s=1/2 Heisenberg Antiferromagnet on the Triangular Lattice: Exact Results and Spin-Wave Theory for Finite Cells

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