title: Statistics of spectra for critical quantum chaos in one-dimensional quasiperiodic systems.
abstract: We study spectral statistics of one-dimensional quasiperiodic systems at the metal-insulator transition. Several types of spectral statistics are observed at the critical points, lines, and region. On the critical lines, we find the bandwidth distribution P(B) (w) around the origin (in the tail) to have the form of P(B) (w) approximately w(alpha) [P(B) (w) approximately e(-beta w(gamma) ) ] (alpha,beta,gamma >0) , while in the critical region P(B) (w) approximately w(- alpha') (alpha' >0) . We also find the level spacing distribution to follow an inverse power law P(G) (s) approximately s(-delta) (delta>0) .
authors.affiliation: Department of Pure and Applied Sciences, University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo, 153-8902, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Takada
authors.forename: Kazusumi
authors.initials: K
authors.lastname: Ino
authors.forename: Masanori
authors.initials: M
authors.lastname: Yamanaka