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The conduction band absorption spectrum of interdiffused InGaAs/GaAs quantum dot infrared photodetectors
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10.1063/1.4729833
/content/aip/journal/jap/111/12/10.1063/1.4729833
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4729833

Figures

Image of FIG. 1.
FIG. 1.

The QD geometry and the dimensions of the calculation domain as used in the band structure calculations.

Image of FIG. 2.
FIG. 2.

The intersubband optical absorption cross section of QD1 for both radial and z-polarized light. The location of the first four z-polarized transition energies is indicated. Shown in the inset is the effective potential through the center of the QD and the location of the energy states that strongly feature in the optical absorption.

Image of FIG. 3.
FIG. 3.

The square of the wavefunction magnitude of the QD1 eigenstates that predominantly feature in the optical absorption cross section.

Image of FIG. 4.
FIG. 4.

The intersubband optical absorption cross section of QD2 for both radial and z-polarized light. Shown in the inset is the effective potential through the center of the QD and the location of some energy states.

Image of FIG. 5.
FIG. 5.

The radial and z-polarized absorption cross section of QD1 for various diffusion lengths. The inset displays the energy shifts of the lower energy states and absorption peak energy as a function of diffusion length.

Image of FIG. 6.
FIG. 6.

The radial and z-polarized absorption cross section of QD2 diffused by various diffusion lengths. The inset displays the energy shifts of some energy states and the absorption peak energy as a function of diffusion length.

Image of FIG. 7.
FIG. 7.

The modification of the potential of QD1 due to diffusion length of 10 Å. The potential profile is taken through the center of the QD.

Image of FIG. 8.
FIG. 8.

QD1 wavefunction of the state for a diffusion length of 20 Å.

Image of FIG. 9.
FIG. 9.

The z and radially polarized optical absorption spectral of QD3 for various diffusion lengths. The inset figure displays the differential shifts in the lowest 4 energy levels and the absorption peak energy.

Image of FIG. 10.
FIG. 10.

The modification of the potential of QD3 due to diffusion of 10 Å. The potential profile is taken through the center of the QD. The decrease in the potential within the center of the QD is due to a relaxation of the strain.

Image of FIG. 11.
FIG. 11.

The hydrostatic component of strain of QD3 for various diffusion lengths. Interdiffusion induces a relaxation of strain in excess of the changes in the composition for regions in the center of the QD.

Tables

Generic image for table
Table I.

The geometries of the 3 QDs that are studied in this work.

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/content/aip/journal/jap/111/12/10.1063/1.4729833
2012-06-26
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The conduction band absorption spectrum of interdiffused InGaAs/GaAs quantum dot infrared photodetectors
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4729833
10.1063/1.4729833
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