Physics – Condensed Matter – Materials Science
Scientific paper
2007-01-04
Physics
Condensed Matter
Materials Science
10 pages, 4 figures, accepted to Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/19/29/295219
We report the detection of quantum confinement in single InAs-InP core-shell nanowires. The wires having an InAs core with ~25 nm diameter are characterized by emission spectra in which two peaks are identified under high excitation intensity conditions. The peaks are caused by emission from the ground and excited quantized levels, due to the quantum confinement in the plane perpendicular to the nanowire axis. We have identified in the emission spectra different energy contributions related to the wurtzite structure of the wires, the strain between the wurtzite core and shell, and the confinement energy of the InAs core. Calculations based on 6-band strain-dependent k.p theory allow the theoretical estimation of the confined energy states in such materials and we found these results to be in good agreement with those from the photoluminescence studies.
Froeberg L. E.
Pistol Mats-Erik
Samuelson Lars
Zanolli Zeila
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