Numéro
J. Phys. IV France
Volume 12, Numéro 9, November 2002
Page(s) 265 - 265
DOI http://dx.doi.org/10.1051/jp4:20020412


J. Phys. IV France
12 (2002) Pr9-265
DOI: 10.1051/jp4:20020412

Spin nematics revisited

V. Cvetkovic, J. Zaanen and Z. Nussinov

Instituut Lorentz, Leiden Universiteit, Leiden, The Netherlands


Abstract
Biquadratic spin 1 Heisenberg spin systems can be constructed exhibiting spin nematic order in higher dimensions. In terms of the original spin degrees of freedom, the spontaneous nematic symmetry breaking generates a Z 2 gauge invariance. Using a generalized Holstein-Primakoff transformation for the underlying U(3) dynamical algebra, we calculate the spin dynamical form factor. Although spin is not a gauge singlet, we find form factor to be finite at finite q and $ $\backslash$omega $\backslash$$, contrary to our expectations regarding the presence of a energy scale protecting the gauge invariance. This result appears to be perturbatively stable.



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