Quantum spin tunneling in a soluble quasi-spin model: an angle-based potential description

D. Galetti, B.M. Pimentel and C.L. Lima

Physica A: Statistical Mechanics and its Applications, 2005, vol. 351, issue 2, 315-331

Abstract: 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.

Keywords: Spin tunneling; Wigner functions; Lipkin model (search for similar items in EconPapers)
Date: 2005
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:351:y:2005:i:2:p:315-331

DOI: 10.1016/j.physa.2004.11.056

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