Observation of resonance condensation of fermionic atom pairs.

By C. Regal, M. Greiner, D. Jin. Physical Review Letters, 2004

1,151 citations recorded by the source corpus.

We have observed condensation of fermionic atom pairs in the BCS-BEC crossover regime. A trapped gas of fermionic 40K atoms is evaporatively cooled to quantum degeneracy and then a magnetic-field Feshbach resonance is used to control the atom-atom interactions. The location of this resonance is precisely determined from low-density measurements of molecule dissociation. In order to search for condensation on either side of the resonance, we introduce a technique that pairwise projects fermionic atoms onto molecules; this enables us to measure the momentum distribution of fermionic atom pairs. The transition to condensation of fermionic atom pairs is mapped out as a function of the initial atom gas temperature T compared to the Fermi temperature T(F) for magnetic-field detunings on both the BCS and BEC sides of the resonance.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/903f8691a6dfed62526163684988133691e53ba0

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In Atomic and Molecular Physics, and Optics

1. Christophe Mora
2. Sahel Ashhab
3. P. Julienne
4. F. Chevy
5. M. Zwierlein
6. C. Chin
7. R. Grimm
8. I. Georgescu

Citations in the corpus

• Feshbach resonances in ultracold gases (2008, background): “(Regal et al., 2004) introduced fast magnetic-field sweeps to observe the condensed fraction of pairs in the crossover.”
• Making, probing and understanding ultracold Fermi gases (2008, methodology): “This method was introduced by the JILA group [69], and later adapted to (6)Li by our group [70].”
• Universal few-body physics and cluster formation (2017, background): “An impressive series of experiments has observed precisely these phenomena (Greiner et al., 2003; Loftus et al., 2002; Regal et al., 2005, 2004b), and this crossover physics has been reviewed by (Regal and Jin, 2007).”
• General coordinate invariance and conformal invariance in nonrelativistic physics: Unitary Fermi gas (2005, methodology): “W e nd the m ost generale ective Lagrangian consistent with both generalcoordinate and conform alinvariance to leading and next-to-leading ordersin the m om entum expansion.”
• New frontiers for quantum gases of polar molecules (2016, background): “eractions in a quantum many-body system [1, 2], and a rich set of experiments has already been performed. Some prominent examples include studies of the BEC-BCS crossover in two-component Fermi gases [3, 4, 5] and the super uid-Mott insulator transition in ultracold bosons loaded into a 3D optical l”
• Quantum Simulation (2013, methodology): “By tuning interatomic interactions using Feshbach resonances, it was possible to investigate the crossover from a Bardeen-Cooper-Schrieffer (BCS) state of weakly attractive fermions to a Bose-Einstein condensate (BEC) of tightly bound fermion pairs (Regal et al., 2004; Zwierlein et al., 2005).”
• Ultra-cold polarized Fermi gases (2010, methodology): “used later on for the study of spin imbalanced gases, and as a consequence we leave out important experiments such as the pair projection method [62, 63] or the study of collective modes [64], and let the reader refer to the more exhaustive review [1]).”