title: Probing the excitonic states of site-controlled GaN nanowire quantum dots.
abstract: 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.
authors.affiliation: Institute for Nano Quantum Information Electronics and ‡Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Holmes
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kako
authors.forename: Kihyun
authors.initials: K
authors.lastname: Choi
authors.forename: Pawel
authors.initials: P
authors.lastname: Podemski
authors.forename: Munetaka
authors.initials: M
authors.lastname: Arita
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Arakawa
keywords: excited states; nanowire; quantum dot; site-control