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Spectral fluctuations of excitonic transitions of InGaAs single quantum dots
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10.1063/1.3676043
/content/aip/journal/apl/100/2/10.1063/1.3676043
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/2/10.1063/1.3676043
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Time evolution of PL spectra: each time slice was averaged for 1 s. (b) Energy shifts of the peaks 3, 4, and 5 over 150 s at an excitation power of 400 nW. The three peak traces exhibit similar-patterned temporal energy fluctuations. Here the similar-patterned temporal jitters are denoted as 3, 4, and 5, whereas the different peaks are denoted as 1, 2. (c) Near-field images of each peak in (a). The image scan area is 800 nm× 800 nm with a pixel size of 20 nm and the excitation power is 400 nW. The crosses in (1)-(5) of (c) represent the center of the QD in the NSOM images. (d) The line profile of the red dotted line (FWHM 320 nm) in (5) of (c). The line profile is fitted by a Gaussian curve to get the FWHM of the optical image, which is used to estimate the spatial resolution of the NSOM.8,13

Image of FIG. 2.
FIG. 2.

(Color online) Time evolution of PL spectra showing the characteristic spectral fluctuation for different excitation powers: (a) 100 nW, (b) 200 nW, (c) 400 nW, and (d) 800 nW. Two emission lines with similar temporal behavior are indicated by arrows 1 and 2. (e) The energy shifts in unit time (1 s) of the brightest peak in group 2 for various excitation powers. (f) A linear fit of the standard deviation of unit time energy shifts as a function of excitation power for arrow 2 in graphs (a), (b), (c), and (d).

Image of FIG. 3.
FIG. 3.

(Color online) Time-integrated spectral diffusion for applied external electric fields at an excitation power of 400 nW. (a) 0 V, (b) 1 V, (c) 2 V, and (d) 3 V applied bias voltage. (e) The difference of energy shifts with 1 s integration depending on various applied bias voltages. (f) A linear fit of the standard deviation of unit time energy shifts as a function of electric field at the specified arrow position. Of note here is how the increasing electric field decreases the jitter, while increasing excitation density increases it.

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/content/aip/journal/apl/100/2/10.1063/1.3676043
2012-01-10
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectral fluctuations of excitonic transitions of InGaAs single quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/2/10.1063/1.3676043
10.1063/1.3676043
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