Motional broadening in ensembles with heavy-tail frequency distribution

Yoav Sagi, Rami Pugatch, Ido Almog, Nir Davidson, Michael Aizenman

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We show that the spectrum of an ensemble of two-level systems can be broadened through "resetting" discrete fluctuations, in contrast to the well-known motional-narrowing effect. The broadening occurs if the ensemble frequency distribution has heavy tails with a diverging first moment. The asymptotic motional broadened line shape is then a Lorentzian. In case there is a physical upper cutoff in the frequency distribution, the broadening effect may still be observed, though only up to a certain fluctuation rate.

Original languageEnglish (US)
Article number043821
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number4
StatePublished - Apr 18 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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