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Zettler, Johannes K; Corfdir, Pierre; Hauswald, Christian; Luna, Esperanza; Jahn, Uwe; Flissikowski, Timur; Schmidt, Emanuel; Ronning, Carsten; Trampert, Achim; Geelhaar, Lutz; Grahn, Holger T; Brandt, Oliver; Fernández-Garrido, Sergio
Nano letters, 02/2016, Letnik: 16, Številka: 2Journal Article
The realization of semiconductor structures with stable excitons at room temperature is crucial for the development of excitonics and polaritonics. Quantum confinement has commonly been employed for enhancing excitonic effects in semiconductor heterostructures. Dielectric confinement, which gives rises to much stronger enhancement, has proven to be more difficult to achieve because of the rapid nonradiative surface/interface recombination in hybrid dielectric-semiconductor structures. Here, we demonstrate intense excitonic emission from bare GaN nanowires with diameters down to 6 nm. The large dielectric mismatch between the nanowires and vacuum greatly enhances the Coulomb interaction, with the thinnest nanowires showing the strongest dielectric confinement and the highest radiative efficiency at room temperature. In situ monitoring of the fabrication of these structures allows one to accurately control the degree of dielectric enhancement. These ultrathin nanowires may constitute the basis for the fabrication of advanced low-dimensional structures with an unprecedented degree of confinement.
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