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Layer-selective spin amplification in size-modulated quantum nanocolumn

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Title: Layer-selective spin amplification in size-modulated quantum nanocolumn
Authors: Hiura, Satoshi Browse this author
Saito, Shotaro Browse this author
Takayama, Junichi Browse this author
Kiba, Takayuki Browse this author →KAKEN DB
Murayama, Akihiro Browse this author →KAKEN DB
Issue Date: 1-Jul-2019
Publisher: American Institute of Physics (AIP)
Journal Title: Applied physics letters
Volume: 115
Issue: 1
Start Page: 013102
Publisher DOI: 10.1063/1.5098110
Abstract: The optical spin properties of size-modulated quantum nanocolumns (QNCs), which are composed of 9 layers of vertically coupled InGaAs quantum dots (QDs), have been studied by circularly polarized time-resolved photoluminescence spectroscopy of QD excited states with barrier excitation. High spin polarization at the emissive state is one of the essential elements in the development of spin-functional optical devices. Coupling of QD excited states can enhance the spin polarization if only minority spins are effectively removed from the emissive excited states. In this study, size-modulated QNCs with the increasing size toward the upper layer were grown, and we revealed that the combination of QD size modulation and electron wavefunction coupling in the stacking direction can greatly enhance spin polarization during light emission from the smaller-sized QD layers. We observed a temporal spin amplification of more than 80% at coupled excited states. This enhancement is derived from the size-modulation-induced selective transfer of minority spins to the larger-sized QD layers, which have abundant excited states where electron spins are transferred. In addition, we found that QNCs can retain high spin polarization even at high excitation spin density. Our findings of spin amplification during light emission will provide QNC systems suitable for spin-functional optical devices. Published under license by AIP Publishing.
Rights: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 115(1), 013102 (2019) and may be found at
Type: article
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 樋浦 諭志

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