Journal
SCIENCE
Volume 328, Issue 5983, Pages 1248-1251Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1187770
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- Geconcerteerde Onderzoeksacties
- Fonds Wetenschappelijk Onderzoek Flanders
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Superradiance, the cooperative spontaneous emission of photons from an ensemble of identical atoms, provides valuable insights into the many-body physics of photons and atoms. We show that an ensemble of resonant atoms embedded in the center of a planar cavity can be collectively excited by synchrotron radiation into a purely superradiant state. The collective coupling of the atoms via the radiation field leads to a substantial radiative shift of the transition energy, the collective Lamb shift. We simultaneously measured the temporal evolution of the superradiant decay and the collective Lamb shift of resonant (57)Fe nuclei excited with 14.4-kilo-electron volt synchrotron radiation. Our experimental technique provides a simple method for spectroscopic analysis of the superradiant emission.
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