Radio-frequency spectroscopy of ultracold fermions

被引：245

作者：

Gupta, S ^{[1
]}

Hadzibabic, Z

Zwierlein, MW

Stan, CA

Dieckmann, K

Schunck, CH

van Kempen, EGM

Verhaar, BJ

Ketterle, W

机构：

[1] MIT, Dept Phys, Harvard Ctr Ultracold Atoms, Cambridge, MA 02139 USA

[2] MIT, Dept Phys, Elect Res Lab, Cambridge, MA 02139 USA

[3] Eindhoven Univ Technol, NL-5600 MB Eindhoven, Netherlands

来源：

SCIENCE | 2003年 / 300卷 / 5626期

关键词：

D O I：

10.1126/science.1085335

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：1723 / 1726

页数：4

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