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Universal entanglement spectra in critical spin chains

Research paper by Rex Lundgren, Jonathan Blair, Pontus Laurell, Nicolas Regnault, Gregory A. Fiete, Martin Greiter, Ronny Thomale

Indexed on: 30 Dec '15Published on: 30 Dec '15Published in: Physics - Strongly Correlated Electrons



Abstract

We advocate that in critical spin chains, and possibly in a larger class of 1D 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 non-universal 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 SU(2)$_2$ or the SU(3)$_1$ Wess-Zumino-Witten model.