Radio-Frequency Spectroscopy of Ultracold Fermions
Soft Condensed Matter
2009-11-10 v1 Superconductivity
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
Cite
@article{arxiv.cond-mat/0307259,
title = {Radio-Frequency Spectroscopy of Ultracold Fermions},
author = {S. Gupta and Z. Hadzibabic and M. W. Zwierlein and C. A. Stan and K. Dieckmann and C. H. Schunck and E. G. M. van Kempen and B. J. Verhaar and W. Ketterle},
journal= {arXiv preprint arXiv:cond-mat/0307259},
year = {2009}
}
Comments
6 pages, 6 figures