Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 20: Fermionic Quantum Gases I (joint session Q/A)

A 20.5: Talk

Wednesday, March 13, 2024, 12:00–12:15, HS 1199

Observation of pairing in a strongly correlated few-fermion system — •Carl Heintze, Sandra Brandstetter, Karen Wadenpfuhl, Philip Lunt, Keerthan Subramanian, Marvin Holten, Maciej Galka, and Selim Jochim — Universität Heidelberg

Strong correlations and entanglement are crucial for many phenomena of modern physics as high temperature superconductivity and the expansion of the early universe. They pose a challenging task for theorists and experimentalists. We address this problem with few body systems of up to 12 particles. They are large enough to build up complex correlations but are experimentally well controlled, allowing us to extract microscopic observables as atom-atom correlations [1]. We work with quasi 2D systems which are prepared in their quantum mechanical ground state with fixed atom number. We use two different matterwave magnification techniques to measure the momentum or position of every single particle in a spin-resolved way. Recently we observed hydrodynamic behaviour in an expanding few particle system accompanied by the formation of atom pairs [2]. As a next step we aim to gain a deeper understanding of pairing by studying real space correlations in the trapped system. Additionally, we want to use RF-spectroscopy to extract the energy spectrum [3]. In the future we want to measure the contact, prepare repulsively interacting systems and observe interference of identical few body systems.

[1] Holten et al. Nature 606 (2022) [2] Brandstetter et al. arXiv: 2308.09699v1 [cond-mat.quant-gas] [3] Wenz et al. Science 342 (2013)

Keywords: Fermions; ultracold; Hydrodynamics; Cooper pairs; few body