Characterizations of Uniform Hyperbolicity and Spectra of CMV Matrices
  We provide an elementary proof of the equivalence of various notions of uniform hyperbolicity for a class of $\mathrm{GL}(2,\mathbb{C})$ cocycles and establish a Johnson-type theorem for extended CMV matrices, relating the spectrum to the points on the unit circle for which the associated Szeg\H{o} cocycle is not uniformly hyperbolic. 
David Damanik (Rice University), Jake Fillman (Rice University),   Milivoje Lukic (University of Toronto and Rice University...
math.SP math-ph math.DS math.MP