1/f noise for intermittent quantum dots exhibits non-stationarity and critical exponents
| Autor: | Sadegh, Sanaz, Barkai, Eli, Krapf, Diego |
|---|---|
| Rok vydání: | 2013 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1367-2630/16/11/113054 |
| Popis: | The power spectrum of quantum dot fluorescence exhibits $1/f^\beta$ noise, related to the intermittency of these nanosystems. As in other systems exhibiting $1/f$ noise, this power spectrum is not integrable at low frequencies, which appears to imply infinite total power. We report measurements of individual quantum dots that address this long-standing paradox. We find that the level of $1/f^\beta$ 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 $\beta$ is incomplete and three additional critical exponents characterize the dependence on experimental time. Comment: 16 pages, 4 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|