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Radio-frequency spectroscopy of ultracold fermions.
Gupta, S; Hadzibabic, Z; Zwierlein, M W; Stan, C A; Dieckmann, K; Schunck, C H; Van Kempen, E G M; Verhaar, B J; Ketterle, W.
Afiliação
  • Gupta S; Department of Physics, Massachusetts Institute of Technology (MIT)-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, MIT, Cambridge, MA 02139, USA. deep@mit.edu
Science ; 300(5626): 1723-6, 2003 Jun 13.
Article em En | MEDLINE | ID: mdl-12738872
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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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Science Ano de publicação: 2003 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Estados Unidos
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Science Ano de publicação: 2003 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Estados Unidos