Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 49: Quantum gases (Miscellaneous)

Q 49.6: Talk

Thursday, March 12, 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. Oberthaler¹ — ¹Kirchhoff-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)