Absolutely Continuous Spectrum for Random Schroedinger Operators on   Tree-Strips of finite cone type
  A tree-strip of finite cone type is the product of a tree of finite cone type with a finite set. We consider random Schr\"odinger operators on these tree strips, similar to the Anderson model. We prove that for small disorder the spectrum is almost surely, purely, absolutely continuous in a certain set. 
Christian Sadel
math-ph math.MP math.SP