Glassy Solutions of the Kardar-Pasrisi-Zhang Equation
  It is shown that the mode-coupling equations for the strong-coupling limit of the KPZ equation have a solution for d>4 such that the dynamic exponent z is 2 (with possible logarithmic corrections) and that there is a delta function term in the height correlation function <h(k,w)h^*(k,w)> = (A/k^{d+4-z}) \delta(w/k^z) where the amplitude A vanishes as d -> 4. The delta function term implies that some features of the growing surface h(x,t) will persist to all times, as in a glassy state. 
M.A. Moore, T. Blum J.P. Doherty, M. Marsili, J-P. Bouchaud and P.   Claudin