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Journal Article

Photoluminescence from seeded three-dimensional InAs/GaAs quantum-dot crystals

MPS-Authors
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Kiravittaya,  S.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Rastelli,  A.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Schmidt,  O. G.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Nanostructuring Lab (Jürgen Weis), Max Planck Institute for Solid State Research, Max Planck Society;
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kiravittaya, S., Rastelli, A., & Schmidt, O. G. (2006). Photoluminescence from seeded three-dimensional InAs/GaAs quantum-dot crystals. Applied Physics Letters, 88(4): 043112.


Cite as: https://hdl.handle.net/21.11116/0000-000F-02AF-A
Abstract
We investigate the photoluminescence (PL) properties of
three-dimensional InAs/GaAs quantum-dot (QD) crystals grown on shallow
modulated periodic hole arrays patterned on GaAs(001). We find that the
PL spectra become narrower and more intense with increasing number of
QD layers. A deconvoluted PL linewidth of 14.9 meV is obtained from a
defect-free QD crystal consisting of 11 stacked QD layers. The PL
spectra obtained for QD crystals containing QD vacancies show
significantly broader spectra. The PL peak energy and linewidth of the
QDs across the whole pattern (100x100 mu m(2)) remain constant within
1.278 +/- 0.001 eV and 21.0 +/- 1.7 meV, respectively. From
power-dependent PL measurement, we can resolve up to seven
excited-state PL peaks confirming the remarkable size homogeneity of
our QD crystals. This experimental result can be reasonably fitted by a
calculation based on random population theory and on a simple model for
the QD confinement potential.