Radio-Frequency Spectroscopy of Ultracold Fermions

Details Radio-Frequency Spectroscopy of Ultracold Fermions Radio-Frequency Spectroscopy of Ultracold Fermions

2003-07-10

arxiv.org/abs/cond-mat/0307259v1

Science, Vol. 300, 13 June 2003: 1723-1726

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 6 figures

Scientific paper

10.1126/science.1085335

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 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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