title: Inverse Anderson transition caused by flatbands.
abstract: We propose a new disorder-induced insulator-metal transition of one-electron states, which may be called the "inverse Anderson transition." We first make a highly degenerated localized states by constructing a three-dimensional periodic system possessing only flat dispersion relations. When we introduce a disorder into it, a finite-size scaling of the level statistics shows two clear (localization-delocalization and delocalization-localization) transitions for a wide range of the energy, with increasing the degree of disorder. These transitions are confirmed also by finding the system-size-independent characteristic of the wave function.
authors.affiliation: Faculty of Engineering, Niigata University, Niigata 950-2181, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Goda
authors.forename: Shinya
authors.initials: S
authors.lastname: Nishino
authors.forename: Hiroki
authors.initials: H
authors.lastname: Matsuda