Absence of absolutely continuous spectrum for random scattering zippers Laurent Marin lrnt.marin@gmail.com GDR DYNQUA. 2013-03-12 11 pages. Absence of absolutely continuous spectrum for random scattering zippers Laurent Marin lrnt.marin@gmail.com Lyapunov exponents random operators scattering zippers Kotani theory 34D08, 34L40, 34L05, 47B80, 82B44 A scattering zipper is a system obtained by concatenation of scattering events with equal even number of incoming and out going channels. The associated scattering zipper operator is the unitary equivalent of Jacobi matrices with matrix entries. For infinite identical events and random phases, Lyapunov exponents positivity is proved and yields to the absence of absolutely continuous spectrum.