title: Dynamic ultraslow optical-matter wave analog of an event horizon.
abstract: We investigate theoretically the effects of a dynamically increasing medium index on optical-wave propagation in a rubidium condensate. A long pulsed pump laser coupling a D2 line transition produces a rapidly growing internally generated field. This results in a significant optical self-focusing effect and creates a dynamically growing medium index anomaly that propagates ultraslowly with the internally generated field. When a fast probe pulse injected after a delay catches up with the dynamically increasing index anomaly, it is forced to slow down and is prohibited from crossing the anomaly, thereby realizing an ultraslow optical-matter wave analog of a dynamic white-hole event horizon.
authors.affiliation: National Institute of Standards & Technology, Gaithersburg, Maryland 20899, USA and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: C J
authors.initials: CJ
authors.lastname: Zhu
authors.affiliation: National Institute of Standards & Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: L
authors.initials: L
authors.lastname: Deng
authors.affiliation: National Institute of Standards & Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: E W
authors.initials: EW
authors.lastname: Hagley
authors.affiliation: Theoretical Physics Division, Chern Institute of Mathematics, NanKai University, Tianjin 300071, People's Republic of China.
authors.forename: Mo-Lin
authors.initials: ML
authors.lastname: Ge