One- and Two-Dimensional Spectral Diffusions in InP/InAs/InP Core–Multishell Nanowires
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概要
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We report on the photoluminescence and time-resolved photoluminescence spectroscopy of wurtzite InP/InAs/InP core–multishell nanowires. Multiple peaks appeared in the photoluminescence spectra owing to the monolayer variation of InAs layers. Each photoluminescence peak has a broad photoluminescence band coming from the inhomogeneous broadening in a core–multishell single nanowire. Inhomogeneous broadening caused time-dependent red shift (spectral diffusion) at a constant energy-loss rate. The long-time-span (${\sim}10$ ns) time-resolved photoluminescence measurement clarified that spectral diffusion takes place in two stages (initially at a fast rate and later at a slow rate). The fast one is ascribed to spectral diffusion on the side of the nanowire and the slow one is ascribed to spectral diffusion at the corner of the nanowire. This suggests that photoexcited excitons in a core–multishell nanowire move from the side of the nanowire toward the corner of the nanowire.
- 2009-04-25
著者
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Motohisa Junichi
Graduate School Of Information Science And Technology And Research Center For Integrated Quantum Ele
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Masumoto Yasuaki
Institute For Solid State Physics The University Of Tokyo
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Ikezawa Michio
Institute Of Physics And Center For Tara (tsukuba Advanced Research Alliance) University Of Tsukuba
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FUKUI Takashi
Graduate School of Information Science and Technology and Research Center for Integrated Quantum Ele
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Pal Bipul
Institute Of Physics University Of Tsukuba
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Goto Ken
Institute Of Industrial Science The University Of Tokyo
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Mohan Premila
Graduate School of Information Science and Technology, Hokkaido University, Kita-14 Nishi-9, Kita-ku, Sapporo 060-0814, Japan
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Fukui Takashi
Graduate School of Information Science and Technology, Hokkaido University, Kita-14 Nishi-9, Kita-ku, Sapporo 060-0814, Japan
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Tomimoto Shinichi
Institute of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
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Pal Bipul
Institute of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
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Goto Ken
Institute of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
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