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The European Physical Journal B

, Volume 70, Issue 3, pp 335–342 | Cite as

Dynamics of the anisotropic two-dimensional XY model

  • L. S. LimaEmail author
  • A. S.T. Pires
Solid State and Materials

Abstract

In this paper we study the dynamics of the two-dimensional XY model with single-ion anisotropy, and spin S = 1, in the large D phase, and low temperatures, using the bond operator formalism. The in-plane structure factor is a delta function. The out of plane shows a three peak structure, which merges in a single peak at the Brillouin zone boundary. We analyze also spin currents generated by a magnetic field gradient. The spin conductivity is calculated, at finite temperature, using the Kubo formula. The model shows unconventional ballistic spin transport at finite temperature. The computed spin conductivity exhibits a nonzero Drude weight at finite temperature. For ω< 2m, where m is the energy gap, the spin conductivity is described solely by the Drude weight. There is a regular contribution to the spin conductivity for ω> 2m, which persist in the zero temperature limit. The conductivity at the critical point, and for small frequencies, is (gμB)2/ħ times a universal scaling function of ħω/kB T.

PACS

75.40.Gb Dynamic properties 75.10.Jm Quantized spin models 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Departamento de FísicaUniversidade Federal de Minas GeraisBelo HorizonteBrazil

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