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Highly Efficient Room-Temperature Electron-Photon Spin Conversion Using a Semiconductor Hybrid Nanosystem with Gradual Quantum Dimensionality Reduction

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/79771

Title: Highly Efficient Room-Temperature Electron-Photon Spin Conversion Using a Semiconductor Hybrid Nanosystem with Gradual Quantum Dimensionality Reduction
Authors: Hiura, Satoshi Browse this author
Takishita, Mizuki Browse this author
Takayama, Junichi Browse this author
Sato, Shino Browse this author
Murayama, Akihiro Browse this author →KAKEN DB
Issue Date: 8-Oct-2020
Publisher: American Physical Society (APS)
Journal Title: Physical review applied
Volume: 14
Issue: 4
Start Page: 044011
Publisher DOI: 10.1103/PhysRevApplied.14.044011
Abstract: Improved electron-photon spin conversion efficiency is a key component of technological platforms for optospintronics integration in information processing; this concept is based on optical devices trans-mitting and receiving spin information superimposed on light. Semiconductor quantum dots (QDs) are the most promising materials for optospintronic devices; however, in addition to their weak room-temperature luminescence, their electron-photon spin conversion efficiencies are lower than 50%. Here, we present semiconductor QDs embedded in quantum wells (QWs) containing quasi-QDs. The proposed semiconductor hybrid nanosystem with gradual quantum dimensionality reduction demonstrates luminescence one order of magnitude stronger than that of conventional QDs and an electron-photon spin conversion efficiency of almost 80% at room temperature. Optical characterization reveals that efficient carrier capture, suppressed depolarized-spin reinjection, and quasi-three-dimensional quantum confinements in the QWs facilitate the highly efficient electron-photon spin conversion. This study constitutes a significant advance towards the realization of QD-based spin-functional optical devices for electron-spin-based quantum information platforms.
Rights: ©2020 American Physical Society
Type: article
URI: http://hdl.handle.net/2115/79771
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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