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- W3098753325 abstract "A conservation law is one of the most fundamental properties in nature, but a certain class of conservation laws' could be spoiled by intrinsic quantum mechanical effects, so-called quantum anomalies. Profound properties of the anomalies have deepened our understanding in quantum many body systems. Here, we investigate quantum anomaly effects in quantum phase transitions between competing orders and striking consequences of their presence. We explicitly calculate topological nature of anomalies of non-linear sigma models (NLSMs) with the Wess-Zumino-Witten (WZW) terms. The non-perturbative nature is directly related with the 't Hooft anomaly matching condition : anomalies are conserved in renormalization group flow. By applying the matching condition, we show massless excitations are enforced by the anomalies in a whole phase diagram in sharp contrast to the case of the Landau-Ginzburg-Wilson theory which only has massive excitations in symmetric phases. Furthermore, we find non-perturbative criteria to characterize quantum phase transitions between competing orders. For example, in 4D, we show the two competing order parameter theories, CP(1) and the NLSM with WZW, describe different universality class. Physical realizations and experimental implication of the anomalies are also discussed." @default.
- W3098753325 created "2020-11-23" @default.
- W3098753325 creator A5077450712 @default.
- W3098753325 date "2016-08-08" @default.
- W3098753325 modified "2023-09-27" @default.
- W3098753325 title "Competing Orders and Anomalies" @default.
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- W3098753325 doi "https://doi.org/10.1038/srep31051" @default.
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