The absolute continuity of the integrated density of states for magnetic Schrödinger operators with certain unbounded random potentials

Details The absolute continuity of the integrated density of states for magnetic Schrödinger operators with certain unbounded random potentials The absolute continuity of the integrated density of states for magnetic Schrödinger operators with certain unbounded random potentials

2001-05-30

arxiv.org/abs/math-ph/0105046v2

Commun. Math. Phys. {\bf 221}, 229-254 (2001)

Physics

Mathematical Physics

This paper will appear in "Communications in Mathematical Physics". It is a revised version of the second part of the first ve

Scientific paper

10.1007/s002200100467

The object of the present study is the integrated density of states of a quantum particle in multi-dimensional Euclidean space which is characterized by a Schr{\"o}dinger operator with magnetic field and a random potential which may be unbounded from above and below. In case that the magnetic field is constant and the random potential is ergodic and admits a so-called one-parameter decomposition, we prove the absolute continuity of the integrated density of states and provide explicit upper bounds on its derivative, the density of states. This local Lipschitz continuity of the integrated density of states is derived by establishing a Wegner estimate for finite-volume Schr\"odinger operators which holds for rather general magnetic fields and different boundary conditions. Examples of random potentials to which the results apply are certain alloy-type and Gaussian random potentials. Besides we show a diamagnetic inequality for Schr\"odinger operators with Neumann boundary conditions.

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