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Optical absorption in semiconductor quantum dots coupling to dispersive phonons of infinite modes
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10.1063/1.4757963
/content/aip/journal/jap/112/7/10.1063/1.4757963
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4757963
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The calculated optical absorption coefficients as function of photon frequency in the case of g = 0.02 and for the spectral densities and . The peak positions of the optical absorption spectrum are 0.00449 for and 0.00498 for . The linewidth from Lorentzian fitting are for and 0.00032 for .

Image of FIG. 2.
FIG. 2.

The line shape of optical absorption spectrum as function of photon frequency with input parameters g = 0.1 and for the spectral density . The solid circles denote the results of measurement in an interface fluctuation quantum dot (Ref. 30, Fig. 2), and the insets show the results of theoretical studies for (a) from Ref. 21 (Fig. 4(a)), and (b) from Ref. 28 (Fig. 1, line A for R = 1.9 nm). The absorption peak position is set to the zero detuning position, the same as in Ref. 30 and the photon frequency is scaled by , the half-width for the low photon frequency side of the peak. Note we claim only that the subgap () optical absorption coefficients scale.

Image of FIG. 3.
FIG. 3.

The optical absorption coefficients as function of photon frequency for the spectral densities and in the case of for different values of coupling constant g = 0.01, 0.03, and 0.05. As the coupling constant increases, the line shape of optical absorption spectrum broadens and the peak position moves to lower photon energy with rapid decrease in intensity at the same time.

Image of FIG. 4.
FIG. 4.

The optical absorption coefficient as function of photon frequency for the spectral densities and in the case of fixed coupling constant g = 0.01 for different values of , 0.08, and 0.1. The intensity of optical absorption spectrum is reduced by more than 60% as the energy difference increases from 0.06 to 0.1.

Image of FIG. 5.
FIG. 5.

The calculated optical absorption coefficients as function of photon frequency in the cases of with g = 0.05, and 0.1 for the spectral densities and . The red shift for the spectral density is much larger than that for .

Image of FIG. 6.
FIG. 6.

The optical absorption coefficients as function of photon frequency with definite values of g = 0.05 and for (a) the spectral densities and and (b) the spectral densities and . Insets: their corresponding spectral densities as function of excited frequency in the case of g = 0.05. Note the abscissae scales of (a) and (b) are different.

Image of FIG. 7.
FIG. 7.

The red shift as function of coupling constant g in the case of for all four kinds of spectral densities. Inset: the red shift for spectral density as function of coupling constant g in the cases of , 0.05, and 0.1.

Image of FIG. 8.
FIG. 8.

The red shift as function of in the case of g = 0.01 for all four kinds of spectral densities. Inset: the red shift for spectral density as function of in the cases of g = 0.05, 0.1, and 0.15.

Image of FIG. 9.
FIG. 9.

The peak height (spectral intensity) of the calculated optical absorption spectrum for spectral density as function of the coupling constant g with , and as function of with the coupling constant g = 0.1, respectively. Inset: the peak height of the optical absorption spectrum for all four kinds of spectral densities as function of the coupling constant g in the case of . Note the lines for and are scaled by.

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/content/aip/journal/jap/112/7/10.1063/1.4757963
2012-10-10
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical absorption in semiconductor quantum dots coupling to dispersive phonons of infinite modes
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4757963
10.1063/1.4757963
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