Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.6: Poster

Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal

Non-equilibrium dynamics in a quasi-1D spinor BEC: demonstration and new probing tools — •Stefan Lannig, Rodrigo Rosa-Medina Pimentel, Maximilian Prüfer, Philipp Kunkel, Christian-Marcel Schmied, Daniel Linnemann, Helmut Strobel, Thomas Gasenzer, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg

We employ a spinor Bose-Einstein condensate of ⁸⁷Rb confined in an elongated dipole trap to study far from equilibrium dynamics with spin exchange interactions. In order to investigate the underlying dynamics we prepare the system in the polar phase and quench into the easy-plane ferromagnetic phase. After an exponential build-up of excitations we identify the emergence of a universal scaling function for intermediate times. By rescaling the power spectra of the transversal spin auto-correlations we extract the corresponding scaling exponents, thereby observing self-similar evolution in time.

We further present an extension of our experimental toolbox for performing local spin rotations. Using acousto-optical deflectors the atomic cloud is addressed by a steerable laser beam. The resulting AC vector Stark shift influences the energies of the individual Zeeman spin components similar to an applied magnetic bias field. Modulating the light intensity at the Larmor frequency enables the implementation of spatially resolved spin rotations. This allows us to explore different initial configurations, and we envision schemes to probe time-time correlations.