Localization of the continuous Anderson Hamiltonian in 1-D

TLDR: In this article, the bottom of the spectrum of the Anderson Hamiltonian with Dirichlet or Neumann boundary conditions was studied, and it was shown that the shape of each eigenfunction, recentered around its maximum and properly rescaled, is given by the inverse of a hyperbolic cosine.

Abstract: We study the bottom of the spectrum of the Anderson Hamiltonian $${\mathcal {H}}_L := -\partial _x^2 + \xi $$ on [0, L] driven by a white noise $$\xi $$ and endowed with either Dirichlet or Neumann boundary conditions. We show that, as $$L\rightarrow \infty $$, the point process of the (appropriately shifted and rescaled) eigenvalues converges to a Poisson point process on $$\mathbf{R}$$ with intensity $$e^x dx$$, and that the (appropriately rescaled) eigenfunctions converge to Dirac masses located at independent and uniformly distributed points. Furthermore, we show that the shape of each eigenfunction, recentered around its maximum and properly rescaled, is given by the inverse of a hyperbolic cosine. We also show that the eigenfunctions decay exponentially from their localization centers at an explicit rate, and we obtain very precise information on the zeros and local maxima of these eigenfunctions. Finally, we show that the eigenvalues/eigenfunctions in the Dirichlet and Neumann cases are very close to each other and converge to the same limits.