Publicação: Quantum spin tunneling in a soluble quasi-spin model: an angle-based potential description
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Elsevier B.V.
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We propose an approach which allows one to construct and use a potential function written in terms of an angle variable to describe interacting spin systems. We show how this can be implemented in the Lipkin-Meshkov-Glick, here considered a paradigmatic spin model. It is shown how some features of the energy gap can be interpreted in terms of a spin tunneling. A discrete Wigner function is constructed for a symmetric combination of two states of the model and its time evolution is obtained. The physical information extracted from that function reinforces our description of phase oscillations in a potential. (c) 2004 Elsevier B.V. All rights reserved.
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spin tunneling, Wigner functions, Lipkin model
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Inglês
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Physica A-statistical Mechanics and Its Applications. Amsterdam: Elsevier B.V., v. 351, n. 2-4, p. 315-331, 2005.
