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- W1679420194 abstract "We construct a nonlinear sigma (NL$sigma$) model description of 2+1d spin systems, by coupling together antiferromagnetic spin chains via interchain exchange terms. Our mapping incorporates methods developed recently by ourselves and by Senthil and Fisher, which aim at describing competition between antiferromagnetic and valence-bond-solid orders in quantum magnets. The resulting 2+1d $O$(4) NL$sigma$ model contains a topological $theta$-term whose vacuum angle $theta$ varies continuously with $delta$, the bond-alternation strength of the interchain interaction. This implies that the $theta$-vacua structure for this NL$sigma$ model can be explored by tuning $delta$ in a suitable 2d spin system, which is strongly reminiscent of the situation for 1+1 AF spin chains with bond-alternation." @default.
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- W1679420194 date "2006-10-27" @default.
- W1679420194 modified "2023-09-24" @default.
- W1679420194 title "Effective field theory with aθ-vacua structure for two-dimensional spin systems" @default.
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- W1679420194 doi "https://doi.org/10.1103/physrevb.74.140407" @default.
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