Radio-frequency spectroscopy of ultracold fermions |
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Authors: | Gupta S Hadzibabic Z Zwierlein M W Stan C A Dieckmann K Schunck C H Van Kempen E G M Verhaar B J Ketterle W |
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Institution: | Department of Physics, Massachusetts Institute of Technology (MIT)-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, MIT, Cambridge, MA 02139, USA. deep@mit.edu |
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Abstract: | Radio-frequency techniques were used to study ultracold fermions. We observed the absence of mean-field "clock" shifts, the dominant source of systematic error in current atomic clocks based on bosonic atoms. This absence is a direct consequence of fermionic antisymmetry. Resonance shifts proportional to interaction strengths were observed in a three-level system. However, in the strongly interacting regime, these shifts became very small, reflecting the quantum unitarity limit and many-body effects. This insight into an interacting Fermi gas is relevant for the quest to observe superfluidity in this system. |
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