Two-dimensional double-quantum spectra reveal collective resonances in an atomic vapor

Details Two-dimensional double-quantum spectra reveal collective resonances in an atomic vapor Two-dimensional double-quantum spectra reveal collective resonances in an atomic vapor

2011-12-01

arxiv.org/abs/1112.0336v1

Physics

Atomic Physics

Scientific paper

We report the observation of double-quantum coherence signals in a gas of potassium atoms at twice the frequency of the one-quantum coherences. Since a single atom does not have a state at the corresponding energy, this observation must be attributed to a collective resonance involving multiple atoms. These resonances are induced by weak inter-atomic dipole-dipole interactions, which means that the atoms cannot be treated in isolation, even at a low density of $10^{12}$ cm$^{-3}$.

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