title: Bosonization for disordered and chaotic systems.
abstract: Using a supersymmetry formalism, we reduce exactly the problem of electron motion in an external potential to a new supermatrix model valid at all distances. All approximate nonlinear sigma models obtained previously for disordered systems can be derived from our exact model using a coarse-graining procedure. As an example, we consider a model for a smooth disorder and demonstrate that using our approach does not lead to a "mode-locking" problem. As a new application, we consider scattering on strong impurities for which the Born approximation cannot be used. Our method provides a new calculational scheme for disordered and chaotic systems.
authors.affiliation: Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany.
authors.forename: K B
authors.initials: KB
authors.lastname: Efetov
authors.forename: G
authors.initials: G
authors.lastname: Schwiete
authors.forename: K
authors.initials: K
authors.lastname: Takahashi