Physics 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Physics
标 题: 超冷费米子的射频谱
发信站: 哈工大紫丁香 (Sat May 24 13:36:39 2003) , 转信
发信站: 瀚海星云
http://www.sciencemag.org/cgi/content/abstract/1085335v1?etoc
Radio-Frequency Spectroscopy of Ultracold Fermions
S. Gupta 1*, Z. Hadzibabic 1, M. W. Zwierlein 1, C. A. Stan 1, K. Dieckmann
1, C. H. Schunck 1, E. G. M. van Kempen 2, B. J. Verhaar 2, W. Ketterle 1
1 Department of Physics, MIT-Harvard Center for Ultracold Atoms, and
Research Laboratory of Electronics, MIT, Cambridge, MA 02139, USA.
2 Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The
Netherlands.
* To whom correspondence should be addressed. E-mail: deep@mit.edu.
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.
Science 10.1126/science.1085335
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