Phase-averaged transport for quasi-periodic Hamiltonians

Details Phase-averaged transport for quasi-periodic Hamiltonians Phase-averaged transport for quasi-periodic Hamiltonians

2004-05-07

arxiv.org/abs/math-ph/0405023v1

Commun. Math. Phys. 227, 515-539, (2002)

Physics

Mathematical Physics

Scientific paper

10.1007/s002200200642

For a class of discrete quasi-periodic Schroedinger operators defined by covariant re- presentations of the rotation algebra, a lower bound on phase-averaged transport in terms of the multifractal dimensions of the density of states is proven. This result is established under a Diophantine condition on the incommensuration parameter. The relevant class of operators is distinguished by invariance with respect to symmetry automorphisms of the rotation algebra. It includes the critical Harper (almost-Mathieu) operator. As a by-product, a new solution of the frame problem associated with Weyl-Heisenberg-Gabor lattices of coherent states is given.

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