Anderson model on Bethe lattices: density of states, localization properties and isolated eigenvalue

TL;DR

This paper investigates Anderson localization on Bethe lattices, analyzing density of states, mobility edges, and eigenvalue localization, revealing a delocalized eigenvalue gap and effects of connectivity and disorder.

Contribution

It combines multiple aspects of Anderson localization on Bethe lattices using the cavity method, including density of states, mobility edge evolution, and eigenvalue separation, which were previously studied separately.

Findings

Smallest eigenvalue remains delocalized below a critical disorder

Mobility edge shifts with disorder and connectivity

Large connectivity limit discussed

Abstract

We revisit the Anderson localization problem on Bethe lattices, putting in contact various aspects which have been previously only discussed separately. For the case of connectivity 3 we compute by the cavity method the density of states and the evolution of the mobility edge with disorder. Furthermore, we show that below a certain critical value of the disorder the smallest eigenvalue remains delocalized and separated by all the others (localized) ones by a gap. We also study the evolution of the mobility edge at the center of the band with the connectivity, and discuss the large connectivity limit.