Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.9: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal

Dynamics of Vector Solitons in Spinor Bose-Einstein Condensates — •Kevin Geier¹, Sebastian Erne^1,2,3, Christian-Marcel Schmied¹, Markus K. Oberthaler¹, and Thomas Gasenzer¹ — ¹Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany — ²Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany — ³VCQ, Atominstitut, TU Wien, Stadionallee 2, 1020 Wien, Austria

We study the role of topological excitations in the non-equilibrium dynamics of a spin-1 Bose-Einstein condensate in one spatial dimension. In absence of the Zeeman effect and spin-spin interactions, the equations of motion reduce to the completely integrable Manakov system, which supports exact vector soliton solutions of dark-bright type. Integrability imposes strong constraints on the system’s dynamics, such that, in essence, solitons always scatter elastically. Tuning the couplings to different mean-field phases, we study the effects of integrability breaking on the solitons’ dynamics by numerically solving the full spin-1 Gross-Pitaevskii equations. Our results reveal non-trivial interaction effects such as inelastic scattering and the decay of solitons into domain walls. We furthermore study the time evolution of correlation functions for a random distribution of solitons in the easy-plane phase in comparison to a system initially prepared in the polar ground state. We find that the system approaches power-law distributions in momentum space reflecting the self-similar coarsening dynamics induced by dynamical instabilities.