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Your search keyword '"Koguchi, N"' showing total 9 results
Start Over Author "Koguchi, N" Journal physica e: low-dimensional systems and nanostructures
9 results on '"Koguchi, N"'

8. Magneto-photoluminescence study in single GaAs/AlGaAs self-assembled quantum dot

Author

Takaaki Mano, Massimo Gurioli, Lucia Cavigli, Takashi Kuroda, Kazuaki Sakoda, M. Abbarchi, Stefano Sanguinetti, G. Kido, Nobuyuki Koguchi, Abbarchi, M, Kuroda, T, Mano, T, Sakoda, K, Kido, G, Koguchi, N, Cavigli, L, Gurioli, M, and Sanguinetti, S

Subjects
Materials science, Photoluminescence, Condensed matter physics, Condensed Matter::Other, Exciton, Energy level splitting, Quantum point contact, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, quantum nanostructure, dropet epitaxy, III-V semiconductors, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Quantum dot, Quantum dot laser, FIS/03 - FISICA DELLA MATERIA, Quantum fluctuation, Quantum well
Abstract

Modified droplet epitaxy GaAs/AlGaAs single quantum dots have been studied by low-temperature magneto-photoluminescence spectroscopy. We observe Zeeman splitting and diamagnetic shift of the neutral exciton line. The Lande g factor of different quantum dots has been measured in a wide range of emission energies (i.e. quantum dot size). The measured g factors and diamagnetic shift are compared with conventional quantum dots grown by the Stranski-Krastanov method, as well as GaAs/AlGaAs quantum wells and fluctuation-induced dots. (c) 2007 Elsevier B.V.

Published
2008
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9. Carrier relaxation in quantum dots without wetting layer

Author

M. Wakaki, Fujio Minami, Nobuyuki Koguchi, Stefano Sanguinetti, Massimo Gurioli, T. Tateno, Takashi Kuroda, Kenji Watanabe, Sanguinetti, S, Gurioli, M, Kuroda, T, Watanabe, K, Tateno, T, Minami, F, Wakaki, M, and Koguchi, N

Subjects
Materials science, Photoluminescence, Condensed matter physics, Quantum dot, Relaxation (NMR), quantum dot, III-V Semiconductors, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter Physics, FIS/03 - FISICA DELLA MATERIA, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Wetting layer
Abstract

We present time resolved photoluminescence measurements of GaAs/Al /sub 0.3/Ga/sub 0.7/As quantum dot structures where no wetting layer is connecting the dots. We show that the two-dimensional character of the wetting layer is not relevant in determining the quantum dot capture, in contrast with the conclusions of several models so far presented in the literature.

Published
2003
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