title: Localization of light in a parity-time-symmetric quasi-periodic lattice.
abstract: We address the propagation of light in a parity-time (PT) symmetric quasi-periodic optical lattice. We show that the PT-symmetry breaking threshold of the system depends on the relative strength of two simple lattices forming quasi-periodic structure. The increase of the imaginary part of such structure leads to a dynamical phase transition from delocalization to re-localization for all eigenmodes. The nontrivial interplay between PT-symmetry breaking and the delocalization-localization transition in the system opens new prospects for the manipulation of dynamical evolution of light beams.
authors.forename: Chao
authors.initials: C
authors.lastname: Hang
authors.forename: Yaroslav V
authors.initials: YV
authors.lastname: Kartashov
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Huang
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Konotop