Abstract
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 language | English (US) |
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Article number | 043821 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 83 |
Issue number | 4 |
DOIs | |
State | Published - Apr 18 2011 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics