AAPPS Bulletin (Nov 2023)

A brief history of free parafermions

  • Murray T. Batchelor,
  • Robert A. Henry,
  • Xilin Lu

Journal volume & issue
Vol. 33, no. 1
pp. 1 – 7


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Abstract In this article we outline the historical development and key results obtained to date for free parafermionic spin chains. The concept of free parafermions provides a natural N-state generalization of free fermions, which have long underpinned the exact solution and application of widely studied quantum spin chains and their classical counterparts. In particular, we discuss the Baxter-Fendley free parafermionic Z(N) spin chain, which is a relatively simple non-Hermitian generalization of the Ising model.