Entanglement entropy with localized and extended interface defects

Ferenc Iglói, Zsolt Szatmári, Yu Cheng Lin

Research output: Contribution to journalArticle

51 Citations (Scopus)


The quantum Ising chain of length, L, which is separated into two parts by localized or extended defects is considered at the critical point where scaling of the interface magnetization is nonuniversal. We measure the entanglement entropy between the two halves of the system in equilibrium, as well as after a quench, when the interaction at the interface is changed for time t>0. For the localized defect the increase in the entropy with logL or with logt involves the same effective central charge, which is a continuous function of the strength of the defect. On the contrary for the extended defect the equilibrium entropy is saturated but the nonequilibrium entropy has a logarithmic time dependence the prefactor of which depends on the strength of the defect.

Original languageEnglish
Article number024405
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
Publication statusPublished - Aug 6 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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