Motional broadening in ensembles with heavy-tail frequency distribution

被引：5

作者：

Sagi, Yoav ^{[1
]}

Pugatch, Rami ^{[1
]}

Almog, Ido ^{[1
]}

Davidson, Nir ^{[1
]}

Aizenman, Michael ^{[2
]}

机构：

[1] Weizmann Inst Sci, Dept Phys Complex Syst, IL-76100 Rehovot, Israel

[2] Princeton Univ, Dept Math & Phys, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW A | 2011年 / 83卷 / 04期

关键词：

ANOMALOUS DIFFUSION; QUANTUM;

D O I：

10.1103/PhysRevA.83.043821

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：5

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