Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 26: Quantum Gases (Fermions)

Q 26.6: Talk

Wednesday, March 16, 2022, 11:45–12:00, Q-H10

Matterwave microscopy of 2D few-fermion systems — •Sandra Brandstetter, Keerthan Subramanian, Carl Heintze, Marvin Holten, Philipp Preiss, and Selim Jochim — Physics Institute, University of Heidelberg, Germany

Recent advances in deterministic preparation of ultracold few-fermion systems in combination with a spin resolved time-of-flight imaging technique with single particle resolution, have led us to the first observation of Pauli crystals [2] - demonstrating correlations in a non-interacting system due to quantum statistics - and Cooper pairing between interacting atoms in different spin states [3]. However, the exploration of correlations in real space has so far remained elusive, owing to the small system size, which we cannot resolve with our optical imaging setup.

In this talk we present the addition of a matter wave microscopy scheme [4], enabling us to access the spatial distribution of our atoms. While the initial spatial distribution is too small to resolve with our imaging setup, we can easily magnify it by a factor of 30, using a combination of two T/4 evolutions in traps with different trapping frequencies. This allows us to study the spatial correlations of few fermions in the BEC-BCS crossover, as well as the nature of the normal phase and pairing in spin-imbalanced systems.

[1] L. Bayha, et al. Nature 587.7835 (2020): 583-587.

[2] M. Holten, et al. Physical Review Letters 126.2 (2021): 020401

[3] M. Holten, et al. arXiv:2109.11511 (2021).

[4] L. Asteria et al. Nature 599, 571*575 (2021).