Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 12: Bosonic Quantum Gases III (joint session Q/A)

A 12.6: Talk

Tuesday, March 12, 2024, 12:15–12:30, Aula

Extreme wave events and spacetime defects in a spinor Bose-Einstein condensate — •Yannick Deller, Ido Siovitz, Alexander Schmutz, Felix Klein, Helmut Strobel, Thomas Gasenzer, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Ruprecht-Karls Universität Heidelberg, Deutschland

Many-body systems far from equilibrium can exhibit self-similar dynamics characterized by universal exponents. Numerical studies of a quenched ferromagnetic spinor BEC have revealed the appearance of extreme wave events on the way to the universal regime [1]. Furthermore, as a result of these caustics, real-time instanton defects are generated, which take on the form of space-time vortices in the transversal spin order parameter. However, the random appearance of real-time instantons in space and time makes it experimentally challenging to study these excitations in a controlled way. Thus we aim for deterministic preparation of a single instanton event. We employ local spin-dependent phase imprints, which lead to excitations in the transversal spin length. We probe their time evolution and characterize their structure with spatially resolved detection of all relevant spin observables.

[1] Siovitz et. al. , PRL 131, 183402 (2023)

Keywords: Spinor Bose-Einstein condensates; Non-equilibrium dynamics