Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 49: Quantum gases (Miscellaneous)

Q 49.6: Vortrag

Donnerstag, 12. März 2020, 15:30–15:45, e214

Non-Linear Multi-Component Excitations in a Spinor Bose-Einstein Condensate — •Stefan Lannig1, Christian-Marcel Schmied1, Maximilian Prüfer1, Philipp Kunkel1, Marc Robin Strohmaier1, Helmut Strobel1, Thomas Gasenzer1, Panayotis G. Kevrekidis2, and Markus K. Oberthaler11Kirchhoff-Institute for Physics, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany — 2Department of Mathematics and Statistics, University of Massachusetts, Amherst, MA 01003-9305, USA

Far from equilibrium the presence or absence of non-linear excitations in a quasi-one-dimensional spinor Bose-Einstein condensate (BEC) leads to different universal scenarios in the effective long-wavelength properties of the system [1, 2]. To investigate this effect, we consider the basic scenario of only a few controlled excitations.

Here, we experimentally study such excitations in a quasi-one-dimensional spin-1 BEC of 87Rb. Using an acousto-optical deflector we generate pairs of multi-component excitations in a controlled manner by local spin rotations and study their properties in the spatial degree of freedom and spin [3]. As these non-linear multi-component excitations exhibit long lifetimes we are able to observe their time evolution, and, in particular, collisions between them. We find that such interactions crucially depend on the internal spin structure of the excitations.

[1] Prüfer, M. et al., Nature 563, 217 (2018)

[2] Schmied, C.-M. et al., Phys. Rev. A 99, 033611 (2019)

[3] Kunkel, P. et al., Phys. Rev. Lett. 123, 063603 (2019)

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