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https://hdl.handle.net/10316/4532
Title: | Long-wave fluctuations of the two-dimensional Heisenberg antiferromagnet | Authors: | Belinicher, Victor Providência, João da |
Keywords: | Antiferromagnet; Disorder; Fluctuations | Issue Date: | 2000 | Citation: | Physica B: Condensed Matter. 284-288:Part 2 (2000) 1579-1580 | Abstract: | We have reduced the Heisenberg model for the quantum antiferromagnet in the leading approximation over 1/s to the spin-rotator model which represents some sort of quantum lattice rotator model. We perform the long-wavelength reduction of this spin-rotator model. An intermediate scale [Lambda] was introduced and the short-wavelength antiferromagnetic spin fluctuations were integrated out. As a result, we obtained the continuum nonlinear sigma model with some additional contributions. We presented arguments showing that this model is renormalizable in the framework of 1/N perturbation theory. We separated out all ultraviolet divergencies and expressed all parameters of the theory in terms of the parameters of the primary Heisenberg model, in the one-loop approximation. | URI: | https://hdl.handle.net/10316/4532 | DOI: | 10.1016/S0921-4526(99)02832-X | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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