Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)

Q 25.61: Poster

Tuesday, March 11, 2025, 14:00–16:00, Tent

Deterministic Generation of Localized Spin Excitations in a Spin-1 BEC — Yannick Deller, •Alexander Schmutz, Raphael Schäfer, Alexander Flamm, Helmut Strobel, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Universität Heidelberg, Deutschland

We present the experimental techniques to reliably generate localized spin excitations in a quasi one-dimensional ferromagnetic spin-1 BEC. We utilize a steerable laser at the tuneout-wavelength for ⁸⁷Rb in order to locally induce an effective magnetic offset field which can be controlled on the µm scale. Localized transitions between hyperfine states are implemented by amplitude modulation of the laser beam at the transition frequency [1].
To characterize the resulting spin excitations, we track their time evolution in all relevant observables by employing a generalized POVM readout scheme [2].
We investigate their properties such as lifetime and propagation speed in different parameter regimes and compare with numerical simulations and analytical models to investigate for a topological classification of the excitations.

1 Lannig et. al., PRL 125, 170401 (2020)
2 Kunkel et. al., PRL 123, 063603 (2019)

Keywords: Spin excitations; Spinor Bose Einstein Condensate; Topological; Quantum Field Simulation; ferromagnetic