Localization by virtual transitions in correlated disorder

Alex Dikopoltsev, Hanan Herzig Sheinfux, Mordechai Segev

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Anderson localization is fundamentally relevant to all physical systems where coherent waves evolve in the presence of disorder. Physically, any disorder must have a finite spectral bandwidth, hence the disorder is always correlated. Here, we study the regime of localization mediated by virtual transitions in correlated disorder. We find that wave packets centered outside of the spectral extent of the disorder can localize, with localization length almost as short as for localization via first-order transitions. In this regime, virtual transitions lead to phenomena with profound significance, such as mobility edges, and strong localization in regions of momentum space where otherwise localization would be extremely weak. Remarkably, in two-dimensional systems, we show localization can occur in directions that cannot be reached by direct scattering from the disordered potential.

Original languageEnglish
Article number140202
Number of pages6
JournalPhysical Review B
Volume100
Issue number14
DOIs
StatePublished - 11 Oct 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.

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