Mainz 2026 – scientific programme

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A: Fachverband Atomphysik

A 5: Ultracold Matter II – Bosons (joint session Q/A)

A 5.7: Talk

Monday, March 2, 2026, 18:30–18:45, P 2

Observation of sine-Gordon solitons in a spinor Bose-Einstein condensate — Yannick Deller, Alexander Schmutz, Raphael Schäfer, •Alexander Flamm, Florian Schmitt, Ido Siovitz, Thomas Gasenzer, Helmut Strobel, and Markus Oberthaler — Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany

Sine-Gordon solitons are a paradigmatic solution of the integrable sine-Gordon model. Utilizing a robust and reproducible local spinor phase imprinting scheme, we are able to produce sine-Gordon solitons in a quasi one-dimensional spin-1 BEC. We report on their time evolution while tuning their velocity by using the effective quadratic Zeeman shift, and therefore observe the characteristic collision behavior of the integrable sine-Gordon model. These results confirm that spinor BECs are a highly controllable experimental platform for studying the dynamics of the sine-Gordon model and its generalizations.

Keywords: sine-Gordon; Soliton; Spinor Bose-Einstein Condensate; Spin excitations; Quantum Field Simulation