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.

Gupta, S., Hadzibabic, Z., Zwierlein, M.w., Stan, C.a., Dieckmann, K., Schunck, C., et al. (2003). Radio-frequency spectroscopy of ultracold fermions. SCIENCE, 300(5626), 1723-1726 [10.1126/science.1085335].

Radio-frequency spectroscopy of ultracold fermions

SCHUNCK, CHRISTIAN;
2003

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.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
English
Medicine (all); Multidisciplinary
Gupta, S., Hadzibabic, Z., Zwierlein, M.w., Stan, C.a., Dieckmann, K., Schunck, C., et al. (2003). Radio-frequency spectroscopy of ultracold fermions. SCIENCE, 300(5626), 1723-1726 [10.1126/science.1085335].
Gupta, S; Hadzibabic, Z; Zwierlein, M; Stan, C; Dieckmann, K; Schunck, C; Van Kempen, E; Verhaar, B; Ketterle, W
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/189734
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