SAMOP 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 22: Poster II
Q 22.30: Poster
Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof
Pair correlations in a strongly interacting two-component Fermi gas — •Manuel Jäger and Johannes Hecker Denschlag — Universität Ulm, Institut für Quantenmaterie, Deutschland
We study pair correlations in a two-component fermionic system. In particular we investigate the crossover from a Bardeen-Cooper-Schrieffer (BCS) superfluid of loosely bound Cooper pairs to a Bose-Einstein condensate (BEC) of tightly bound dimers.
For studying this system experimentally, we use a spin-balanced mixture of the two lowest 6Li Zeeman states and set their interaction strength by means of the Feshbach resonance at 832 G. We then perform photoexcitation of the pairs at various temperatures and interaction strengths. The photoexcitation induces a two-body loss in our system. From analyzing the loss rate we obtain Tan’s contact.
Our measurements of the two-body contact extend previously reported measurements and calculations carried out at low temperatures and at unitarity. Moreover, we find that our results above 0.5 TF can be well described by the second order quantum virial expansion in the whole BCS-BEC crossover.