Quantum confinement effects in InAs-InP core-shell nanowires

Details Quantum confinement effects in InAs-InP core-shell nanowires Quantum confinement effects in InAs-InP core-shell nanowires

2007-01-04

arxiv.org/abs/cond-mat/0701082v1

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.

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