Discrete Schrödinger operators with random alloy-type potential

Details Discrete Schrödinger operators with random alloy-type potential Discrete Schrödinger operators with random alloy-type potential

2011-07-14

arxiv.org/abs/1107.2800v1

Physics

Mathematical Physics

Proceedings of the Spectral Days 2010, Pontificia Universidad Cat\'olica de Chile, Santiago

Scientific paper

We review recent results on localization for discrete alloy-type models based on the multiscale analysis and the fractional moment method, respectively. The discrete alloy-type model is a family of Schr\"odinger operators $H_\omega = - \Delta + V_\omega$ on $\ell^2 (\ZZ^d)$ where $\Delta$ is the discrete Laplacian and $V_\omega$ the multiplication by the function $V_\omega (x) = \sum_{k \in \ZZ^d} \omega_k u(x-k)$. Here $\omega_k$, $k \in \ZZ^d$, are i.i.d. random variables and $u \in \ell^1 (\ZZ^d ; \RR)$ is a so-called single-site potential. Since $u$ may change sign, certain properties of $H_\omega$ depend in a non-monotone way on the random parameters $\omega_k$. This requires new methods at certain stages of the localization proof.

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