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ファイル | 記述 | サイズ | フォーマット | |
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PhysRevLett.119.247401.pdf | 750.5 kB | Adobe PDF | 見る/開く |
タイトル: | Harmonic Quantum Coherence of Multiple Excitons in PbS/CdS Core-Shell Nanocrystals |
著者: | Tahara, Hirokazu https://orcid.org/0000-0002-0738-5623 (unconfirmed) Sakamoto, Masanori https://orcid.org/0000-0001-5018-5590 (unconfirmed) Teranishi, Toshiharu https://orcid.org/0000-0002-5818-8865 (unconfirmed) Kanemitsu, Yoshihiko https://orcid.org/0000-0002-0788-131X (unconfirmed) |
著者名の別形: | 田原, 弘量 坂本, 雅典 寺西, 利治 金光, 義彦 |
キーワード: | Excitons Nanocrystals Nonlinear optics Quantum dots Semiconductor compounds Optical absorption spectroscopy Ultrafast pump-probe spectroscopy |
発行日: | 11-Dec-2017 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review Letters |
巻: | 119 |
号: | 24 |
論文番号: | 247401 |
抄録: | The generation and recombination dynamics of multiple excitons in nanocrystals (NCs) have attracted much attention from the viewpoints of fundamental physics and device applications. However, the quantum coherence of multiple exciton states in NCs still remains unclear due to a lack of experimental support. Here, we report the first observation of harmonic dipole oscillations in PbS/CdS core-shell NCs using a phase-locked interference detection method for transient absorption. From the ultrafast coherent dynamics and excitation-photon-fluence dependence of the oscillations, we found that multiple excitons cause the harmonic dipole oscillations with ω, 2ω, and 3ω oscillations, even though the excitation pulse energy is set to the exciton resonance frequency, ω. This observation is closely related to the quantum coherence of multiple exciton states in NCs, providing important insights into multiple exciton generation mechanisms. |
記述: | 半導体ナノ粒子が光を電子へ変換する過程を解明 --高効率な太陽電池や光検出器への基礎メカニズム--. 京都大学プレスリリース. 2017-12-14. |
著作権等: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
URI: | http://hdl.handle.net/2433/228205 |
DOI(出版社版): | 10.1103/PhysRevLett.119.247401 |
PubMed ID: | 29286717 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2017-12-14-1 |
出現コレクション: | 学術雑誌掲載論文等 |
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