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Showing 1 to 1 of 1 for “"Modular Anomaly"”.
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Aspects of critical spin 1 chains and 2 dimensional symmetry protected topological phases of matter
… such as Z_K or Z_K x Z_K symmetry. We argue that modular invariance/noninvariance of the partition function of the one-dimensional edge theory can be used to diagnose whether, by adding a suitable potential, the edge theory can be gapped or not without breaking the symmetry. By taking bosonic …