Radio-frequency spectroscopy of ultracold fermions

S. Gupta; Z. Hadzibabic; M.W. Zwierlein; C.A. Stan; K. Dieckmann; C.H. Schunck; E.G.M. Kempen, van; B.J. Verhaar; W. Ketterle

doi:10.1126/science.1085335

Radio-frequency spectroscopy of ultracold fermions

S. Gupta, Z. Hadzibabic, M.W. Zwierlein, C.A. Stan, K. Dieckmann, C.H. Schunck, E.G.M. Kempen, van, B.J. Verhaar, W. Ketterle

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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.

Original language	English
Pages (from-to)	1723-1726
Journal	Science
Volume	300
Issue number	5626
DOIs	https://doi.org/10.1126/science.1085335
Publication status	Published - 2003

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AU - Gupta, S.

AU - Hadzibabic, Z.

AU - Zwierlein, M.W.

AU - Stan, C.A.

AU - Dieckmann, K.

AU - Schunck, C.H.

AU - Kempen, van, E.G.M.

AU - Verhaar, B.J.

AU - Ketterle, W.

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

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DO - 10.1126/science.1085335

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SN - 0036-8075

VL - 300

SP - 1723

EP - 1726

JO - Science

JF - Science

IS - 5626

ER -

Radio-frequency spectroscopy of ultracold fermions

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