Characterization of the Spectrum of the Landau Hamiltonian with Delta Impurities

Details Characterization of the Spectrum of the Landau Hamiltonian with Delta Impurities Characterization of the Spectrum of the Landau Hamiltonian with Delta Impurities

1999-04-28

arxiv.org/abs/math-ph/9904035v1

Physics

Mathematical Physics

To appear in Commun. Math. Phys. (1999)

Scientific paper

10.1007/s002200050650

We consider a random Schro\"dinger operator in an external magnetic field. The random potential consists of delta functions of random strengths situated on the sites of a regular two-dimensional lattice. We characterize the spectrum in the lowest N Landau bands of this random Hamiltonian when the magnetic field is sufficiently strong, depending on N. We show that the spectrum in these bands is entirely pure point, that the energies coinciding with the Landau levels are infinitely degenerate and that the eigenfunctions corresponding to energies in the remainder of the spectrum are localized with a uniformly bounded localization length. By relating the Hamiltonian to a lattice operator we are able to use the Aizenman-Molchanov method to prove localization.

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