Nonperturbative effects of Topological Theta-term

Details Nonperturbative effects of Topological Theta-term Nonperturbative effects of Topological Theta-term

2011-12-22

arxiv.org/abs/1112.5303v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

We study the effects of a topological Theta-term on 2+1 dimensional principal chiral models, which are nonlinear sigma models defined on Lie group manifolds. We find that when Theta = Pi, the nature of the disordered phase of the principal chiral model is strongly affected by the topological term: it is either a gapless conformal field theory, or it is gapped and two-fold degenerate.

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