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L Campos Venuti1, C Degli Esposti Boschi2, E Ercolessi1,2,3, F Ortolani1,2,3, G Morandi1,2,3, S Pasini1,3 and M Roncaglia1,2,3
Published 11 February 2005 •
IOP Publishing Ltd
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Citation L Campos Venuti et al J. Stat. Mech. (2005) L02004
DOI 10.1088/1742-5468/2005/02/L02004
210 Total downloads
Using new as well as known results on dimerized quantum spin chains with frustration, we are able to infer some properties on the low-energy spectrum of the O(3) Nonlinear Sigma Model with a topological θ-term. In particular, for sufficiently strong coupling, we find a range of values of θ where a singlet bound state is stable under the triplet continuum. On the basis of these results, we propose a new renormalization group flow diagram for the Nonlinear Sigma Model with a θ-term.
