An introduction to the spectrum, symmetries, and dynamics of spin-1/2   Heisenberg chains
  Quantum spin chains are prototype quantum many-body systems. They are employed in the description of various complex physical phenomena. The goal of this paper is to provide an introduction to the subject by focusing on the time evolution of a Heisenberg spin-1/2 chain and interpreting the results based on the analysis of the eigenvalues, eigenstates, and symmetries of the system. We make available online all computer codes used to obtain our data. 
Kira Joel, Davida Kollmar, and Lea F. Santos
cond-mat.stat-mech quant-ph