Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum Gases (Fermions) I

Q 35.4: Talk

Wednesday, March 13, 2019, 15:00–15:15, S HS 037 Informatik

A few-body approach to pairing correlations in a two-dimensional Fermi gas — •Ralf Klemt, Jan Hendrik Becher, Ram-Janik Petzold, Philipp M. Preiss, and Selim Jochim — Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg

Strong pairing correlations are, in combination with a shell structure, the central mechanism leading to the structure of atomic and nuclear matter but are also key to understanding the nature of strongly correlated fermionic many-body-phases as seen for example in the framework of the BEC-BCS crossover.

In this talk, I present recent experimental efforts on realizing and probing deterministic few-body states of fermionic ⁶Li in a two-dimensional geometry. In the presence of strong interactions, it was theoretically shown [1] that such a system features signatures which can be interpreted as the few-body precursor of a normal to superfluid transition. As a consequence, in this superfluid phase strong pairing correlations at the “Fermi-surface”, reminiscent of Cooper-pairing in many-body systems, are present.

We will characterize such few-body systems by probing the excitation spectrum of the pairing mode as well as by directly observing single particle resolved spin-spin correlations in momentum space. However, the unique opportunity to directly observe all relevant correlations will also help bridging the gap toward the understanding of strongly interacting fermionic 2D systems in the many-body limit.

[1] J. Bjerlin et al., PRL. 116, 155302 (2016)