Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Photonics I
Q 36.7: Vortrag
Mittwoch, 8. März 2017, 16:15–16:30, P 11
Bloch oscillations sustained by nonlinearity — •Rodislav Driben1, Vladimir Konotop2, Torsten Meier1, and Alexey Yulin3 — 1Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany — 2Centro de Fisica Teorica e Computacional and Departamento de Fisica, Universida de Lisboa — 3ITMO University, 49 Kronverskii Ave., St. Petersburg 197101, Russian Federation
We demonstrate that, contrary to general belief, a nonlinearity may play a constructive role in supporting Bloch oscillations in a model which is discrete, in one dimension and continuous in the orthogonal one. Such a model can be experimentally realized in several fields of physics such as optics and Bose-Einstein condensates. We demonstrate that designing an optimal relation between the nonlinearity and the linear gradient strength provides extremely long-lived Bloch oscillations with little degradation. Such robust oscillations can be observed for a broad range of parameters and even for moderate nonlinearities and large enough force gradients. We also present an approximate analytical description for the wave packet evolution featuring a hybrid Bloch oscillating wave-soliton behavior that excellently corresponds to the direct numerical simulations.