Mobility Edge in Aperiodic Kronig-Penney Potentials with Correlated   Disorder: Perturbative Approach
  It is shown that a non-periodic Kronig-Penney model exhibits mobility edges if the positions of the scatterers are correlated at long distances. An analytical expression for the energy-dependent localization length is derived for weak disorder in terms of the real-space correlators defining the structural disorder in these systems. We also present an algorithm to construct a non-periodic but correlated sequence exhibiting desired mobility edges. This result could be used to construct window filters in electronic, acoustic, or photonic non-periodic structures. 
F.M.Izrailev, A.A.Krokhin, and S.E.Ulloa