H. Schulz-Baldes
Perturbation theory for Lyapunov exponents 
of an Anderson model on a strip
(1822K, Postscript)

ABSTRACT.  It is proven that the localization length of an Anderson model on a 
strip of width $L$ is bounded above by $L/\lambda^2$ for small values 
of the coupling constant $\lambda$ of the disordered potential. For 
this purpose, a new formalism is developed in order to calculate the 
bottom Lyapunov exponent associated with random products of large 
symplectic matrices perturbatively in the coupling constant of the 
randomness.