17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Observation of Cooper Pairs in a Mesoscopic 2D Fermi Gas

20 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session

Description

Pairing is the fundamental requirement for fermionic superfluidity and superconductivity. To understand the mechanism behind pair formation is an ongoing challenge in the study of many strongly correlated fermionic systems.
On this poster, I present the direct observation of Cooper pairs in our experiment. We have implemented a fluorescence imaging technique that allows us to extract the full in-situ momentum distribution with single particle and spin resolution. We apply it to a mesoscopic Fermi gas, prepared deterministically in the ground state of a two-dimensional harmonic oscillator. Our ultracold gas allows us to tune freely between a completely non-interacting unpaired system and weak attractions where we find Cooper pair correlations at the Fermi surface. When increasing the interactions even further, the pair character is modified and the pairs gradually turn into tightly bound dimers. The collective behavior that we discover in our mesoscopic system is closely related to observations in nuclear physics or metallic grains. Our method provides a new pathway to study many of the outstanding questions concerning fermionic pairing, for example in imbalanced systems or the normal phase.

Presenter name Marvin Holten
online poster URL https://drive.google.com/file/d/1FQRI8EKqYa-Rbg8iMmZ__rCKqTLXyIrS/view?usp=sharing

Primary author

Marvin Holten (University of Heidelberg)

Co-authors

Dr Luca Bayha (University of Heidelberg) Mr Keerthan Subramanian (University of Heidelberg) Mrs Sandra Brandstetter (University of Heidelberg) Mr Carl Heintze (University of Heidelberg) Mr Philipp Lunt (University of Heidelberg) Dr Philipp Preiss (University of Heidelberg) Prof. Selim Jochim (University of Heidelberg)

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