Semicircle law on short scales and delocalization of eigenvectors for Wigner random matrices
نویسندگان
چکیده
We consider N × N Hermitian random matrices with i.i.d. entries. The matrix is normalized so that the average spacing between consecutive eigenvalues is of order 1/N . We study the connection between eigenvalue statistics on microscopic energy scales η ≪ 1 and (de)localization properties of the eigenvectors. Under suitable assumptions on the distribution of the single matrix elements, we first give an upper bound on the density of states on short energy scales of order η ∼ logN/N . We then prove that the density of states concentrates around the Wigner semicircle law on energy scales η ≫ N. We show that most eigenvectors are fully delocalized in the sense that their l-norms are comparable with N 1 p − 1 2 for p ≥ 2, and we obtain the weaker bound N 2 3 `
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