Decay of an ultracold fermionic lithium gas near a Feshbach resonance

Abstract

We studied the magnetic field dependence of the inelastic decay of an ultracold, optically trapped 6-Li gas of different spin compositions. The spin mixture of the two lowest hyperfine states showed two decay resonances at 550 G and 680 G due to two-body collisions, close to the predicted Feshbach resonance of the elastic s-wave collisions at 800 G. The rapid decay near Feshbach resonances found in bosonic gases was found to be suppressed by the Pauli exclusion principle. The observed lifetimes of several hundred milliseconds are much longer than the expected time for Cooper pair formation and the phase transition to superfluidity in the vicinity of the Feshbach resonance.

4 pages, 2 figures

Cited by in corpus (109)

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• Observation of Bose-Einstein Condensation of Molecules
• Creation of ultracold molecules from a Fermi gas of atoms
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• Conversion of an Atomic Fermi Gas to a Long-Lived Molecular Bose Gas
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• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms
• Measurement of positive and negative scattering lengths in a Fermi gas of atoms
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• Spin 1/2 Fermions in the Unitary Regime: A Superfluid of a New Type
• Observation of molecules produced from a Bose-Einstein condensate
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
• Quantum degenerate two-species Fermi-Fermi mixture coexisting with a Bose-Einstein condensate
• Multiplet Structure of Feshbach Resonances in non-zero partial waves
• P-wave Feshbach resonances of ultra-cold ${}^6$Li
• Feshbach Resonances in Fermionic Lithium-6
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• Fifty-fold improvement in the number of quantum degenerate fermionic atoms
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
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• An effective theory of Feshbach resonances and many-body properties of Fermi gases
• Measurement of a Mixed Spin Channel Feshbach Resonance in Rubidium 87
• Resonant scattering properties close to a p-wave Feshbach resonance
• Realization of a Resonant Fermi Gas with a Large Effective Range
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• Realization of a Strongly Interacting Fermi Gas of Dipolar Atoms
• Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms
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• Phase Separation Dynamics Induced by an Interaction Quench of a Correlated Fermi-Fermi Mixture in a Double Well
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• The Nature and Properties of a Repulsive Fermi Gas in the "Upper Branch"
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• Detection of spatial correlations in an ultracold gas of fermions
• Inelastic Collisions of a Fermi Gas in the BEC-BCS Crossover
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• Mixing-demixing in a trapped degenerate fermion-fermion mixture
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• Dressed-molecules in resonantly-interacting ultracold atomic Fermi gases
• Observation of Anomalous Decay of a Polarized Three-Component Fermi Gas
• Detecting high-dimensional entanglement in cold-atom quantum simulators
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