Radio-Frequency Spectroscopy of Ultracold Fermions

Preprint

10 July 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0307259

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 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

FREQUENCY SPECTROSCOPY
FREQUENCY TECHNIQUES
ULTRACOLD FERMIONS
SYSTEMATIC ERROR
FERMIONS RADIO
SPECTROSCOPY
RADIO
CLOCK

All Related Versions

Version 1, 2003-07-10, ArXiv
Published version: Science, 300 (5626), 1723.

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