title: Disordered weak and strong topological insulators.
abstract: A global phase diagram of disordered weak and strong topological insulators is established numerically. As expected, the location of the phase boundaries is renormalized by disorder, a feature recognized in the study of the so-called topological Anderson insulator. Here, we report unexpected quantization, i.e., robustness against disorder of the conductance peaks on these phase boundaries. Another highlight of the work is on the emergence of two subregions in the weak topological insulator phase under disorder. According to the size dependence of the conductance, the surface states are either robust or "defeated" in the two subregions. The nature of the two distinct types of behavior is further revealed by studying the Lyapunov exponents.
authors.affiliation: Department of Physics, Sophia University, Tokyo, Chiyoda-ku 102-8554, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Kobayashi
authors.affiliation: Department of Physics, Sophia University, Tokyo, Chiyoda-ku 102-8554, Japan.
authors.forename: Tomi
authors.initials: T
authors.lastname: Ohtsuki
authors.affiliation: Department of Quantum Matter, AdSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Ken-Ichiro
authors.initials: K
authors.lastname: Imura