Two-dimensional double-quantum spectra reveal collective resonances in an atomic vapor
Atomic Physics
2012-10-31 v1 Chemical Physics
Optics
Abstract
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 cm.
Keywords
Cite
@article{arxiv.1112.0336,
title = {Two-dimensional double-quantum spectra reveal collective resonances in an atomic vapor},
author = {Xingcan Dai and Marten Richter and Hebin Li and Alan D. Bristow and Cyril Falvo and Shaul Mukamel and Steven T. Cundiff},
journal= {arXiv preprint arXiv:1112.0336},
year = {2012}
}