title: Possible realization of directional optical waveguides in photonic crystals with broken time-reversal symmetry.
abstract: We show how, in principle, to construct analogs of quantum Hall edge states in "photonic crystals" made with nonreciprocal (Faraday-effect) media. These form "one-way waveguides" that allow electromagnetic energy to flow in one direction only.
authors.affiliation: Department of Physics, Princeton University, Princeton, NJ 08544-0708, USA.
authors.forename: F D M
authors.initials: FD
authors.lastname: Haldane
authors.forename: S
authors.initials: S
authors.lastname: Raghu