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Perturbation theory for Lyapunov exponents of an Anderson model on a strip

It is proven that the inverse localization length of an Anderson model on a strip of width $L$ is bounded above by $L/λ^2$ for small values of the coupling constant $λ$ of the disordered potential. For this purpose, a 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.

preprint2004arXivOpen access
Hermann Schulz-Baldes
math-phmath.MPcond-mat.dis-nn
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Hermann Schulz-Baldes

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