Real Space Renormalization Group Study of the S=1/2 XXZ Chains with   Fibonacci Exchange Modulation
  Ground state properties of the S=1/2 antiferromagnetic XXZ chain with Fibonacci exchange modulation are studied using the real space renormalization group method for strong modulation. The quantum dynamical critical behavior with a new universality class is predicted in the isotropic case. Combining our results with the weak coupling renormalization group results by Vidal et al., the ground state phase diagram is obtained. 
Kazuo Hida