Abstract
We advocate that in critical spin chains, and possibly in a larger class of one-dimensional critical models, a gap in the momentum-space entanglement spectrum separates the universal part of the spectrum, which is determined by the associated conformal field theory, from the nonuniversal part, which is specific to the model. To this end, we provide affirmative evidence from multicritical spin chains with low-energy sectors described by the or the Wess-Zumino-Witten model.
- Received 11 January 2016
- Revised 4 August 2016
DOI:https://doi.org/10.1103/PhysRevB.94.081112
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