Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 15: Ultra-cold atoms, ions and BEC II (joint session A/Q)
A 15.3: Talk
Wednesday, March 16, 2022, 11:00–11:15, A-H2
Two-body correlations in imbalanced quantum systems — •Carl Heintze1, Keerthan Subramanian1, Sandra Brandstetter1, Marvin Holten1, Philipp Preiß1, 2, and Selim Jochim1 — 1Physikalisches Institut, Im Neuenheimer Feld 226, 69120 Heidelberg — 2Max Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching
Superfluidity in strongly correlated systems still poses a challenging task for experimentalists and theorists. Explaining the phenomenon with pair formation enables us to tackle the problem in the limit of strongly bound particles building up molecules (BEC limit) and delocalized zero momentum pairs (BCS limit). Nevertheless, complete and verified theories of strongly correlated regimes in between are still missing. Additionally, there are ongoing discussions about the pairing mechanisms, the breakdown of superfluidity and the rich phase diagram in imbalanced systems.
Our experiment focuses on the emergence of correlations and collective behaviour in many particle systems from the few-particle limit. The apparatus enables us to prepare small quantum systems (two to twelve particles) deterministically in a two-dimensional harmonic oscillator and to image the final state with spin and single particle resolution. Therefore, we can extract the in-situ two-body correlations in momentum as well as in real space. By using spectroscopic measurements, we are also able to measure excitation spectra.
Recently we achieved to prepare imbalanced systems (3+1, 6+3, 6+1 particles) and to measure their momentum correlations.