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Title: Strong spin-orbit coupling inducing Autler-Townes effect in lead halide perovskite nanocrystals
Authors: Yumoto, Go  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-6489-343X (unconfirmed)
Hirori, Hideki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6056-8675 (unconfirmed)
Sekiguchi, Fumiya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-9063-9064 (unconfirmed)
Sato, Ryota
Saruyama, Masaki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-8723-910X (unconfirmed)
Teranishi, Toshiharu
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0788-131X (unconfirmed)
Author's alias: 湯本, 郷
廣理, 英基
関口, 文哉
佐藤, 良太
猿山, 雅亮
寺西, 利治
金光, 義彦
Keywords: Nonlinear optics
Semiconductors
Issue Date: 2021
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 12
Thesis number: 3026
Abstract: Manipulation of excitons via coherent light-matter interaction is a promising approach for quantum state engineering and ultrafast optical modulation. Various excitation pathways in the excitonic multilevel systems provide controllability more efficient than that in the two-level system. However, these control schemes have been restricted to limited control-light wavelengths and cryogenic temperatures. Here, we report that lead halide perovskites can lift these restrictions owing to their multiband structure induced by strong spin-orbit coupling. Using CsPbBr₃ perovskite nanocrystals, we observe an anomalous enhancement of the exciton energy shift at room temperature with increasing control-light wavelength from the visible to near-infrared region. The enhancement occurs because the interconduction band transitions between spin-orbit split states have large dipole moments and induce a crossover from the two-level optical Stark effect to the three-level Autler-Townes effect. Our finding establishes a basis for efficient coherent optical manipulation of excitons utilizing energy states with large spin-orbit splitting.
Description: ペロブスカイトナノ粒子において近赤外光による大きな超高速光変調を室温で実現 --光通信帯における新たな超高速光スイッチング技術の開発に期待--. 京都大学プレスリリース. 2021-05-24.
Rights: © The Author(s) 2021
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
URI: http://hdl.handle.net/2433/262991
DOI(Published Version): 10.1038/s41467-021-23291-w
PubMed ID: 34021150
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-05-24-0
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