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Nano Lett. 2013;13(11):5367-72. doi: 10.1021/nl4028878. Epub 2013 Oct 23.

Illuminating the second conduction band and spin-orbit energy in single wurtzite InP nanowires.

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1
Department of Physics, University of Cincinnati , Cincinnati, Ohio 45221-0011, United States.

Abstract

We use polarized photoluminescence excitation spectroscopy to observe the energy and symmetry of the predicted second conduction band in 130 nm diameter wurtzite InP nanowires. We find direct spectroscopic signatures for optical transitions among the A, B, and C hole bands and both the first and the second conduction bands. We determine that the splitting between the first and second conduction bands is 228 ± 7 meV in excellent agreement with theory. From these energies we show that the spin-orbit energy changes substantially between zinc blende and wurtzite InP. We discuss the two quite different solutions within the quasi-cubic approximation and the implications for these measurements. Finally, the observation of well-defined optical transitions between the B- and C-hole bands and the second conduction band suggests that either the theoretical description of the second conduction band as possessing Γ8 symmetry is incomplete, or other interactions are enabling these forbidden transitions.

PMID:
24134708
DOI:
10.1021/nl4028878
[Indexed for MEDLINE]
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