Entanglement of excited states in critical spin chians

Autor:	Berganza, Miguel Ibanez, Alcaraz, Francisco Castilho, Sierra, German
Rok vydání:	2011
Předmět:	Condensed Matter - Statistical Mechanics High Energy Physics - Theory Quantum Physics
Druh dokumentu:	Working Paper
DOI:	10.1088/1742-5468/2012/01/P01016
Popis:	Renyi 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 in reference (Alcaraz et. al., Phys. Rev. Lett. 106, 201601 (2011)), 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 Renyi entropy in excited states and descendant fields are also discussed. Comment: 23 pages, 13 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1109.5673 Zobrazit plný text záznamu View this record from Arxiv