Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Ultra-cold Atoms, Ions and BEC II (joint session A/Q)

Q 23.1: Invited Talk

Tuesday, March 11, 2025, 11:00–11:30, KlHS Mathe

Ultracold and ultrafast: Tandem ion imaging and electron spectroscopy for quantum gases — Jette Heyer, Julian Fiedler, Mario Großmann, Lasse Paulsen, Marlon Hoffmann, Markus Drescher, Klaus Sengstock, Juliette Simonet, and •Philipp Wessels-Staarmann — Center for Optical Quantum Technologies, Universität Hamburg, Hamburg, Germany

Ultrashort laser pulses provide new pathways for probing and manipulating ultracold quantum gases. The strong light field of such a laser pulse can locally ionize few or many atoms in a Bose-Einstein condensate. This allows creating hybrid quantum systems consisting of ultracold atoms and ions. Moreover, an ultrafast excitation of interacting Rydberg atoms below the blockade radius becomes possible within femtoseconds due to the large bandwidth of the laser pulse.

Here we present a new instrument for charged particle analysis of ultracold atoms consisting of a tandem ion microscope and velocity-map-imaging electron spectrometer tailored to resolve the dynamics of these systems. The ion microscope can track the position of ions with a high spatial resolution, while the velocity-map-imaging spectrometer can measure the momentum of the electrons. Moreover, we can detect both properties in coincidence due to a high detection efficiency. A time-resolved extraction and detection on single digit nanosecond timescales allows following the emergence of correlations and many-body phenomena in interacting quantum systems of charged particles.

This work is funded by the Cluster of Excellence "CUI: Advanced Imaging of Matter" of the DFG - EXC 2056 - project ID 390715994.

Keywords: Ultracold atoms; Ultrafast laser pulses; Ion microscopy; Velocity-map imaging spectrometer; Ultracold ions