Probing the Excitonic States of Site-Controlled GaN Nanowire Quantum Dots

We report the detection of fully confined excited states and the zero-absorption region of individual site-controlled GaN/AlGaN nanowire quantum dots using photoluminescence excitation spectroscopy, which provides evidence of the true zero-dimensional discrete density of states of such quantum dots....

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Published inNano letters Vol. 15; no. 2; pp. 1047 - 1051
Main Authors Holmes, Mark J, Kako, Satoshi, Choi, Kihyun, Podemski, Pawel, Arita, Munetaka, Arakawa, Yasuhiko
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 11.02.2015
Subjects
quantum dot
site-control
excited states
nanowire
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Summary:We report the detection of fully confined excited states and the zero-absorption region of individual site-controlled GaN/AlGaN nanowire quantum dots using photoluminescence excitation spectroscopy, which provides evidence of the true zero-dimensional discrete density of states of such quantum dots. Because of the strong quantum confinement in these dots, the p-shell, d-shell, and even higher energy (including some f-shell) states of a single quantum dot are observed, which provides unprecedented insight into the electronic structure. Several emitters are measured and used to build up an average picture of the electronic structure of a single quantum dot via comparison to theoretical simulations.
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ISSN:1530-6984
1530-6992
DOI:10.1021/nl503949u