Dynamics and stability of Bose-Einstein solitons in tilted optical lattices
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2010
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American Physical Society
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Abstract
Bloch oscillations of Bose-Einstein condensates realize sensitive matter-wave interferometers. We investigate the dynamics and stability of bright-soliton wave packets in one-dimensional tilted optical lattices with a modulated mean-field interaction g(t). By means of a time-reversal argument, we prove the stability of Bloch oscillations of breathing solitons that would be quasistatically unstable. Floquet theory shows that these breathing solitons can be more stable against certain experimental perturbations than rigid solitons or even noninteracting wave packets.
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©2010 The American Physical Society.
Travel between Bayreuth and Madrid was supported by the joint program Acciones Integradas of Deutscher Akademscher Auslandsdienst (DAAD) and Ministerio de Educación y Ciencia (MEC). C.G. and C.A.M acknowledge financial support from Deutsche Forschungsgemeinschaft (DFG), and thank H.-C. Nägerl and his group for hospitality and helpful discussions. Work at Madrid was supported by MEC (Project MOSAICO). Work at Maceio was partially supported by the Brazilian research agencies Conselho Nacional de Desenvolvimento Científico e Tecnologico (CNPq) and Coordenac ión de Aperfecionamiento de Pessoal de Nível Superior (CAPES).