Radio-Frequency Spectroscopy of Ultracold Fermions

Authors:

13 June 2003

journal article
other
Published by American Association for the Advancement of Science (AAAS) in Science

Vol. 300 (5626) , 1723-1726
DOI:10.1126/science.1085335
PMID:12738872

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.

Keywords

All Related Versions

Version 1, 2003-07-10, ArXiv

This publication has 26 references indexed in Scilit:

Sodium Bose-Einstein Condensates in the $F = 2$ State in a Large-Volume Optical Trap
Physical Review Letters, 2003
Observation of a Strongly Interacting Degenerate Fermi Gas of Atoms
Science, 2002
Measurement of the zero crossing in a Feshbach resonance of fermionic $^{6} Li$
Physical Review A, 2002
Cold Atom Clocks
Physica Scripta, 2001
Measurement and Cancellation of the Cold Collision Frequency Shift in an $^{87} Rb$ Fountain Clock
Physical Review Letters, 2000
Onset of Fermi Degeneracy in a Trapped Atomic Gas
Science, 1999
Cooper-pair formation in trapped atomic Fermi gases
Physical Review A, 1999
Elastic and inelastic collisions of $^{6} Li$ atoms in magnetic and optical traps
Physical Review A, 1998
Eliminating cold-collision frequency shifts
Physical Review A, 1995
Laser-cooled Cs frequency standard and a measurement of the frequency shift due to ultracold collisions
Physical Review Letters, 1993