Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10728511 | Physics Letters A | 2005 | 5 Pages |
Abstract
The spin Green's function of the antiferromagnetic Heisenberg model on a triangular lattice is calculated using Mori's projection operator technique. At T=0 the spin excitation spectrum is shown to have gaps at the wave vectors of the classical Néel ordering. This points to the absence of the antiferromagnetic long-range order in the ground state. The calculated spin correlation on the neighboring sites of the same sublattice is in good agreement with the value derived from exact diagonalization. The temperature dependencies of the spin correlations and the gaps are calculated.
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Physical Sciences and Engineering
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Authors
P. Rubin, A. Sherman,