Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 31: Poster Session III
A 31.13: Poster
Donnerstag, 9. März 2017, 17:00–19:00, P OG1
Pairing in the normal phase of a quasi-2D Fermi gas — •Ralf Klemt1, Marvin Holten1, Mathias Neidig1, Puneet Murthy1, Philipp M. Preiß1, Gerhard Zuern1, Igor Boettcher2, Tilman Enss3, and Selim Jochim1 — 1Physikalisches Institut, Universität Heidelberg, Germany — 2Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada — 3Institute for Theoretical Physics, University of Heidelberg, Germany
Pairing is the crucial ingredient for fermionic superfluidity. For weakly interacting superfluids, Bardeen Cooper Schrieffer (BCS) theory successfully predicts important properties as for example the critical temperature TC, the specific heat, the pairing gap and the second order nature of the phase transition. Here, pairing occurs at same temperature as the phase transition. However, the nature of pairing for strongly interacting systems is not yet well understood. In particular, strong interactions can drive pairing even above TC. This is especially true for 2D systems, where the nature of pairing is still a matter of debate.
Here we report on our experimental results on pairing in the normal phase of a two component 2D Fermi gas. We use spatially resolved radio-frequency (RF) spectroscopy to probe the onset of pairing at different interaction strengths across the 2D BEC-BCS crossover. As we can probe our inhomogeneous system locally, also the density dependence is recorded. We map out a large pairing regime above the critical temperature, where we observe pairing to be influenced by many body effects in the strongly interacting regime.