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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum Gases (Fermions) I
Q 25.3: Vortrag
Montag, 5. März 2018, 16:45–17:00, K 1.022
High temperature pairing in a strongly interacting two-dimensional Fermi gas — •Luca Bayha1, Puneet Murthy1, Mathias Neidig1, Ralf Klemt1, Igor Boettcher2, Tilman Enss3, Marvin Holten1, Gerhard Zürn1, Philipp Preiss1, and Selim Jochim1 — 1Physikalisches Institut, Universität Heidelberg — 2Department of Physics, Simon Fraser University — 3Institut für Theoretische Physik, Universität Heidelberg
Understanding the nature of the normal phase of strongly correlated Fermi systems is a fascinating open question in many-body physics.
In this talk I will present recent measurements, where we observe many-body pairing in a strongly interacting quasi two-dimensional ultracold Fermi gas at temperatures far above critical temperature for superfluidity. We employ spatially resolved radio-frequency spectroscopy to probe the pairing energy in the system. We identify and study a regime in the normal phase, where the pairing gap shows a clear density dependence and significantly exceeds the intrinsic two-body binding energy. This implies that pairing in this regime is driven by many-body correlations, rather than two-body physics. These correlations are remarkably robust against thermal fluctuations, as the effects persist up to temperatures close to the Fermi-temperature.