Vadim Kostrykin and Ivan Veselic
On the Lipschitz continuity of the integrated density of states for 
sign-indefinite potentials
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ABSTRACT.  The present paper is devoted to the study of spectral properties of random Schroedinger operators. Using a finite section method for Toeplitz matrices, we prove a Wegner estimate for some 
alloy type models where the single site potential is allowed to change 
sign. The results apply to the corresponding discrete model, too. In 
certain disorder regimes we are able to prove the Lipschitz continuity of the integrated density of states and/or localization near spectral edges.