Finite-size scaling of the entanglement entropy of the quantum Ising chain with homogeneous, periodically modulated and random couplings

Ferenc Iglói, Yu Cheng Lin

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Using free-fermionic techniques we study the entanglement entropy of a block of contiguous spins in a large finite quantum Ising chain in a transverse field, with couplings of different types: homogeneous, periodically modulated and random. We carry out a systematic study of finite-size effects at the quantum critical point, and evaluate subleading corrections both for open and for periodic boundary conditions. For a block corresponding to a half of a finite chain, the position of the maximum of the entropy as a function of the control parameter (e.g.the transverse field) can define the effective critical point in the finite sample. On the basis of homogeneous chains, we demonstrate that the scaling behavior of the entropy near the quantum phase transition is in agreement with the universality hypothesis, and calculate the shift of the effective critical point, which has different scaling behaviors for open and for periodic boundary conditions.

Original languageEnglish
Article numberP06004
JournalJournal of Statistical Mechanics: Theory and Experiment
Volume2008
Issue number6
DOIs
Publication statusPublished - Jun 1 2008

Keywords

  • Entanglement in extended quantum systems (theory)
  • Finite-size scaling
  • Ladders and planes (theory)
  • Spin chains

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Statistics, Probability and Uncertainty

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