Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-06-23
New J. Phys. 12 103039 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 3 tables, 2 figures
Scientific paper
We study, on the basis of the general entangled-plaquette variational ansatz, the ground-state properties of the spin-1/2 antiferromagnetic Heisenberg model on the triangular lattice. Our numerical estimates are in good agreement with available exact results and comparable, for large system sizes, to those computed via the best alternative numerical approaches, or by means of variational schemes based on specific (i.e., incorporating problem dependent terms) trial wave functions. The extrapolation to the thermodynamic limit of our results for lattices comprising up to N=324 spins yields an upper bound of the ground-state energy per site (in units of the exchange coupling) of $-0.5458(2)$ [$-0.4074(1)$ for the XX model], while the estimated infinite-lattice order parameter is $0.3178(5)$ (i.e., approximately 64% of the classical value).
Cirac Juan Ignacio
Mezzacapo Fabio
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