The Spectrum of a Magnetic Schrödinger Operator with Randomly Located Delta Impurities

Details The Spectrum of a Magnetic Schrödinger Operator with Randomly Located Delta Impurities The Spectrum of a Magnetic Schrödinger Operator with Randomly Located Delta Impurities

1999-04-27

arxiv.org/abs/math-ph/9904031v2

Physics

Mathematical Physics

38 pages, LaTeX2e, macros included (to appear in J. Math. Phys.)

Scientific paper

We consider a single band approximation to the random Schroedinger operator in an external magnetic field. The spectrum of such an operator has been characterized in the case where delta impurities are located on the sites of a lattice. In this paper we generalize these results by letting the delta impurites have random positions as well as strengths; they are located in squares of a lattice with a general bounded distribution. We characterize the entire spectrum of this operator when the magnetic field is sufficiently high. We show that the whole spectrum is pure point, the energy coinciding with the first Landau level is infinitely degenerate and that the eigenfunctions corresponding to other Landau band energies are exponentially localized.

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