Anomalous excitation facilitation in inhomogeneously broadened Rydberg gases

@article{Letscher2017AnomalousEF,
  title={Anomalous excitation facilitation in inhomogeneously broadened Rydberg gases},
  author={Fabian Letscher and Oliver Thomas and Thomas Niederprum and Herwig Ott and Michael Fleischhauer},
  journal={Physical Review A},
  year={2017},
  volume={95}
}
When atomic gases are laser driven to Rydberg states in an off resonant way, a single Rydberg atom may enhance the excitation rate of surrounding atoms. This leads to a facilitated excitation referred to as Rydberg anti-blockade. In the usual facilitation scenario, the detuning of the laser from resonance compensates the interaction shift. Here, we discuss a different excitation mechanism, which we call anomalous facilitation. This occurs on the "wrong side" of the resonance and originates from… 

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