4 research outputs found
One-dimensional models of disordered quantum wires: general formalism
In this work we describe, compile and generalize a set of tools that can be
used to analyse the electronic properties (distribution of states, nature of
states, ...) of one-dimensional disordered compositions of potentials. In
particular, we derive an ensemble of universal functional equations which
characterize the thermodynamic limit of all one-dimensional models and which
only depend formally on the distributions that define the disorder. The
equations are useful to obtain relevant quantities of the system such as
density of states or localization length in the thermodynamic limit
Projective dynamics and first integrals
We present the theory of tensors with Young tableau symmetry as an efficient
computational tool in dealing with the polynomial first integrals of a natural
system in classical mechanics. We relate a special kind of such first
integrals, already studied by Lundmark, to Beltrami's theorem about
projectively flat Riemannian manifolds. We set the ground for a new and simple
theory of the integrable systems having only quadratic first integrals. This
theory begins with two centered quadrics related by central projection, each
quadric being a model of a space of constant curvature. Finally, we present an
extension of these models to the case of degenerate quadratic forms.Comment: 39 pages, 2 figure