Mutual information and boson radius in a c=1 critical system in one dimension

Shunsuke Furukawa, Vincent Pasquier, Jun'Ichi Shiraishi

Research output: Contribution to journalArticlepeer-review

147 Citations (Scopus)


We study the generic scaling properties of the mutual information between two disjoint intervals, in a class of one-dimensional quantum critical systems described by the c=1 bosonic field theory. A numerical analysis of a spin-chain model reveals that the mutual information is scale invariant and depends directly on the boson radius. We interpret the results in terms of correlation functions of branch-point twist fields. The present study provides a new way to determine the boson radius, and furthermore demonstrates the power of the mutual information to extract more refined information of conformal field theory than the central charge.

Original languageEnglish
Article number170602
JournalPhysical review letters
Issue number17
Publication statusPublished - 2009 Apr 29
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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