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1/ƒ noise for intermittent quantum dots exhibits nonstationarity and critical exponents

Date

2014-11

Authors

Sadegh, Sanaz, author
Barkai, Eli, author
Krapf, Diego, author
IOP Publishing Ltd., publisher

Journal Title

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Abstract

The power spectrum of quantum dot (QD) fluorescence exhibits 1/ƒ β noise, related to the intermittency of these nanosystems. As in other systems exhibiting 1/ƒ noise, this power spectrum is not integrable at low frequencies, which appears to imply infinite total power. We report measurements of individual QDs that address this long-standing paradox. We find that the level of 1/ƒ β noise decays with the observation time. The change of the spectrum with time places a bound on the total power. These observations are in stark contrast with most measurements of noise in macroscopic systems which do not exhibit any evidence for non-stationarity. We show that the traditional description of the power spectrum with a single exponent β is incomplete and three additional critical exponents characterize the dependence on experimental time.

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Subject

nanocrystals
1/ƒ noise
power spectrum
blinking

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