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Title: Harmonic Quantum Coherence of Multiple Excitons in PbS/CdS Core-Shell Nanocrystals
Authors: Tahara, Hirokazu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0738-5623 (unconfirmed)
Sakamoto, Masanori  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-5018-5590 (unconfirmed)
Teranishi, Toshiharu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5818-8865 (unconfirmed)
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0788-131X (unconfirmed)
Author's alias: 田原, 弘量
坂本, 雅典
寺西, 利治
金光, 義彦
Keywords: Excitons
Nanocrystals
Nonlinear optics
Quantum dots
Semiconductor compounds
Optical absorption spectroscopy
Ultrafast pump-probe spectroscopy
Issue Date: 11-Dec-2017
Publisher: American Physical Society (APS)
Journal title: Physical Review Letters
Volume: 119
Issue: 24
Thesis number: 247401
Abstract: 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.
Description: 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.
Rights: 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(Published Version): 10.1103/PhysRevLett.119.247401
PubMed ID: 29286717
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2017-12-14-1
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