title: Ultraslow optical solitons in a cold four-state medium.
abstract: We show the formation of ultraslow optical solitons in a lifetime broadened four-state atomic medium under Raman excitation. With appropriate conditions we demonstrate, both analytically and numerically, that both bright and dark ultraslow optical solitons can occur in such a highly resonant medium with remarkable propagation characteristics. This work may open other research opportunities in condensed matter and may result in a substantial impact on technology.
authors.affiliation: Electron & Optical Physics Division, NIST, Gaithersburg, Maryland 20899, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: L
authors.initials: L
authors.lastname: Deng