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Double quantum dot in a quantum dash: Optical properties
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10.1063/1.4829700
/content/aip/journal/jap/114/18/10.1063/1.4829700
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/18/10.1063/1.4829700
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The schematic shape of a QDash. Top view (a) of the area of two width fluctuations. The cross section (b) of a QDash is a circular segment with constant height to width ratio. The symbols appearing in the figure are defined in the text.

Image of FIG. 2.
FIG. 2.

The single carrier QDash energy spectra for holes (a) and electrons (b). The dashed line denotes the bottom of the effective potential. The presented spectra correspond to a QDash with no trapping center (λ = 0.00), a STQDash with central trapping center (*) and DTQDash (**) with two identical widenings ( ). For the case of the DTQDash the two lowest energy states are trapped within the potential fluctuations.

Image of FIG. 3.
FIG. 3.

The absorption intensities (a) and (c) as well as the polarization properties (b) and (d) for several relevant lowest energy exciton eigenstates (the ground state Ψ and excited bright states Ψ) with large enough transition probability as a function of trapping depth for a QDash with a single (a) and (b) and double (c) and (d) trapping.

Image of FIG. 4.
FIG. 4.

The exciton energy spectrum as a function of the distance between the centers of the widenings ( symmetry preserved). The linewidth of the bright states is proportional to the absorption intensity. Dark states are denoted by dashed lines.

Image of FIG. 5.
FIG. 5.

The absorption intensities and the degree of linear polarization as a function of the distance between the centers of two identical widenings. Only the lowest energy excitonic eigenstates with highest intensities have been shown (Ψ).

Image of FIG. 6.
FIG. 6.

The exciton energy spectrum as a function of the value of the widening parameter λ with constant λ = 0.10. An anti-crossing feature can be observed at λ = 0.10. The linewidth if proportional to the absorption intensity. The positions of widenings are  = 68 nm and  = 82 nm.

Image of FIG. 7.
FIG. 7.

The absorption intensities (a) and the degree of linear polarization (b) as a function of the value of the widening parameter λ. For λ = 0.10 a formation of sub- (Ψ) and super-radiant states (Ψ) can be observed. Higher energy excitonic states (Ψ) with highest intensities have also been shown.

Image of FIG. 8.
FIG. 8.

The exciton energy spectrum as a function of the right widening length . The left widening length is set to  = 10 nm. The linewidth if proportional to the absorption intensity.

Image of FIG. 9.
FIG. 9.

The absorption intensities for several lowest energy exciton eigenstates (a) and the degree of linear polarization (b) as a function of the widening length . A strong enhancement of the ground state (Ψ) and decline in the intensity of the first excited state (Ψ) can be observed around the point of λ = λ. The intensities and the DOP of higher energy excitonic states Ψ and Ψ have been provided for reference.

Image of FIG. 10.
FIG. 10.

The impurity of the ground state (Ψ) and the first excited state (Ψ) as a function of widening parameter λ (a) and widening length (b).

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/content/aip/journal/jap/114/18/10.1063/1.4829700
2013-11-14
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Double quantum dot in a quantum dash: Optical properties
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/18/10.1063/1.4829700
10.1063/1.4829700
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