Entanglement of excited states in critical spin chains
Abstract
Rényi and von Neumann entropies quantifying the amount of entanglement in ground states of critical spin chains are known to satisfy a universal law which is given by the conformal field theory (CFT) describing their scaling regime. This law can be generalized to excitations described by primary fields in CFT, as was done by Alcaraz et al in 2011 (see reference [1], of which this work is a completion). An alternative derivation is presented, together with numerical verifications of our results in different models belonging to the c = 1, 1/2 universality classes. Oscillations of the Rényi entropy in excited states are also discussed.
- Publication:
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Journal of Statistical Mechanics: Theory and Experiment
- Pub Date:
- January 2012
- DOI:
- 10.1088/1742-5468/2012/01/P01016
- arXiv:
- arXiv:1109.5673
- Bibcode:
- 2012JSMTE..01..016I
- Keywords:
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- Condensed Matter - Statistical Mechanics;
- High Energy Physics - Theory;
- Quantum Physics
- E-Print:
- 23 pages, 13 figures