title: Magnetic-field-driven localization of light in a cold-atom gas.
abstract: We discover a transition from extended to localized quasimodes for light in a gas of immobile two-level atoms in a magnetic field. The transition takes place either upon increasing the number density of atoms in a strong field or upon increasing the field at a high enough density. It has many characteristic features of a disorder-driven (Anderson) transition but is strongly influenced by near-field interactions between atoms and the anisotropy of the atomic medium induced by the magnetic field.
authors.affiliation: Université Grenoble Alpes, LPMMC, F-38000 Grenoble, France and CNRS, LPMMC, F-38000 Grenoble, France.
authors.forename: S E
authors.initials: SE
authors.lastname: Skipetrov
authors.affiliation: Department of Theoretical Physics, St. Petersburg State Polytechnic University, 195251 St. Petersburg, Russia.
authors.forename: I M
authors.initials: IM
authors.lastname: Sokolov