Upper bounds on wavepacket spreading for random Jacobi matrices

Abstract

A method is presented for proving upper bounds on the moments of the position operator when the dynamics of quantum wavepackets is governed by a random (possibly correlated) Jacobi matrix. As an application, one obtains sharp upper bounds on the diffusion exponents for random polymer models, coinciding with the lower bounds obtained in a prior work. The second application is an elementary argument (not using multiscale analysis or the Aizenman-Molchanov method) showing that under the condition of uniformly positive Lyapunov exponents, the moments of the position operator grow at most logarithmically in time.

final version, to appear in CMP

References in corpus (3)

• Perturbative test of single parameter scaling for 1D random media
• Lyapunov exponents at anomalies of SL(2,R)-actions
• Upper Bounds in Quantum Dynamics

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