Level spacing and Poisson statistics for continuum random Schrödinger operators
Summary: We prove a probabilistic level-spacing estimate at the bottom of the spectrum for continuum alloy-type random Schrödinger operators, assuming sign-definiteness of a single-site bump function and absolutely continuous randomness. More precisely, given a finite-volume restriction of the random operator onto a box of linear size \(L\), we prove that with high probability the eigenvalues below some threshold energy \(E_{\mathrm{sp}}\) keep a distance of at least \(e^{-\log L)^\beta}\) for sufficiently large \(\beta>1\). This implies simplicity of the spectrum of the infinite-volume operator below \(E_{\mathrm{sp}}\). Under the additional assumption of Lipschitz-continuity of the single-site probability density we also prove a Minami-type estimate and Poisson statistics for the point process given by the unfolded eigenvalues around a reference energy \(E\).
scientific article; zbMATH DE number 7357349
scientific article