Level statistics of one-dimensional Schr\"odinger operators with random decaying potential

We study the level statistics of one-dimensional Schr\"odinger operator with random potential decaying like $x^{-\alpha}$ at infinity. We consider the point process $\xi_L$ consisting of the rescaled eigenvalues and show that : (i)(ac spectrum case) for $\alpha > \frac 12$, $\xi_L$ converges to a clock process, and the fluctuation of the eigenvalue spacing converges to Gaussian. (ii)(critical case) for $\alpha = \frac 12$, $\xi_L$ converges to the limit of the circular $\beta$-ensemble.