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Localization of Excitons in Thin Core-Multi-Shell Quantum Well Tubes

Published online by Cambridge University Press:  01 April 2014

Teng Shi ,
Howard E. Jackson ,
Leigh Morris Smith ,
Jan M. Yarrison-Rice ,
Bryan Wong ,
Joanne Etheridge ,
Nian Jiang ,
Qiang Gao ,
Hark Hoe Tan  and
Chennupati Jagadish
Teng Shi
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio, USA
Howard E. Jackson
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio, USA
Leigh Morris Smith
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio, USA
Jan M. Yarrison-Rice
Affiliation:
Department of Physics, Miami University, Oxford, Ohio, USA
Bryan Wong
Affiliation:
Sandia National Laboratories, Livermore, California, USA.
Joanne Etheridge
Affiliation:
Monash Centre for Electron Microscopy, Monash University, Victoria, Victoria, Australia
Nian Jiang
Affiliation:
Department of Electronic Materials Engineering, Australian National University, Canberra, Australian Capital Territory, Australia
Qiang Gao
Affiliation:
Department of Electronic Materials Engineering, Australian National University, Canberra, Australian Capital Territory, Australia
Hark Hoe Tan
Affiliation:
Department of Electronic Materials Engineering, Australian National University, Canberra, Australian Capital Territory, Australia
Chennupati Jagadish
Affiliation:
Department of Electronic Materials Engineering, Australian National University, Canberra, Australian Capital Territory, Australia
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Abstract

Recently, Fickenscher et al. [1] have shown that, in a core-multi-shell structure where a GaAs quantum well is embedded into an AlGaAs shell wrapped around a [111] oriented GaAs nanowire, the electron and hole ground states are strongly confined to the corners of the hexagonally symmetric quantum well. Thus this confinement defines quantum wires which run along the length of the nanowires along its corners. Here we review single nanowire photoluminescence measurements which show the significant confinement energy of the excitons. For well widths larger than 5 nm, optical transitions between electron and hole excited states can be seen in excitation spectra, while for widths less than 5 nm only the ground state optical transitions are observed. For well widths smaller than 5 nm, high resolution spatially resolved photoluminescence measurements show directly the appearance of localized states. Single nanowire spectra from the 4 nm QWT sample display ultranarrow emission lines on the high energy side of the luminescence band. Spatially-resolved PL images show that these quantum dots are localized randomly along the length of the wire.

Keywords

nanostructuresemiconductingoptical properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1659: Symposium SS/XX – Micro- and Nanoscale Systems – Novel Materials, Structures and Devices , 2014 , pp. 135 - 138
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

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