title: Stationary and drifting localized structures near a multiple bifurcation point
abstract: Localized states embedded in a patterned background are found in numerical simulations of spontaneous pattern formation in a spin-1/2 atomic system with optical feedback. In the vicinity of a parameter region with bistability between two homogeneous states large amplitude peaks as well as dark holes exist as stable localized states on a hexagonal background. Moreover, resonant interaction between oscillatory and stationary inhomogeneous modes produces a nonstationary background which may force the localized states to drift.
authors.affiliation: Institute of Physics, Academy of Sciences, Skaryna avenue 70, 220072 Minsk, Belarus and Institut fur Angewandte Physik, Westfalische Wilhelms-Universitat Munster, Corrensstrasse 2/4, D-48149 Munster, Federal Republic of Germany.
authors.initials: YA
authors.lastname: Logvin
authors.initials: B
authors.lastname: Schapers
authors.initials: T
authors.lastname: Ackemann