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Terahertz-field-induced polar charge order in electronic-type dielectrics

Ultrafast electronic-phase change in solids by light, called photoinduced phase transition, is a central issue in the field of non-equilibrium quantum physics, which has been developed very recently. In most of those phenomena, charge or spin orders in an original phase are melted by photocarrier ge...

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Autores principales: Yamakawa, H., Miyamoto, T., Morimoto, T., Takamura, N., Liang, S., Yoshimochi, H., Terashige, T., Kida, N., Suda, M., Yamamoto, H. M., Mori, H., Miyagawa, K., Kanoda, K., Okamoto, H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7878852/
https://www.ncbi.nlm.nih.gov/pubmed/33574221
http://dx.doi.org/10.1038/s41467-021-20925-x
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author Yamakawa, H.
Miyamoto, T.
Morimoto, T.
Takamura, N.
Liang, S.
Yoshimochi, H.
Terashige, T.
Kida, N.
Suda, M.
Yamamoto, H. M.
Mori, H.
Miyagawa, K.
Kanoda, K.
Okamoto, H.
author_facet Yamakawa, H.
Miyamoto, T.
Morimoto, T.
Takamura, N.
Liang, S.
Yoshimochi, H.
Terashige, T.
Kida, N.
Suda, M.
Yamamoto, H. M.
Mori, H.
Miyagawa, K.
Kanoda, K.
Okamoto, H.
author_sort Yamakawa, H.
collection PubMed
description Ultrafast electronic-phase change in solids by light, called photoinduced phase transition, is a central issue in the field of non-equilibrium quantum physics, which has been developed very recently. In most of those phenomena, charge or spin orders in an original phase are melted by photocarrier generations, while an ordered state is usually difficult to be created from a non-ordered state by a photoexcitation. Here, we demonstrate that a strong terahertz electric-field pulse changes a Mott insulator of an organic molecular compound in κ-(ET)(2)Cu[N(CN)(2)]Cl (ET = bis(ethylenedithio)tetrathiafulvalene), to a macroscopically polarized charge-order state; herein, electronic ferroelectricity is induced by the collective intermolecular charge transfers in each dimer. In contrast, in an isostructural compound, κ-(ET)(2)Cu(2)(CN)(3), which shows the spin-liquid state at low temperatures, a similar polar charge order is not stabilized by the same terahertz pulse. From the comparative studies of terahertz-field-induced second-harmonic-generation and reflectivity changes in the two compounds, we suggest the possibility that a coupling of charge and spin degrees of freedom would play important roles in the stabilization of polar charge order.
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spelling pubmed-78788522021-02-24 Terahertz-field-induced polar charge order in electronic-type dielectrics Yamakawa, H. Miyamoto, T. Morimoto, T. Takamura, N. Liang, S. Yoshimochi, H. Terashige, T. Kida, N. Suda, M. Yamamoto, H. M. Mori, H. Miyagawa, K. Kanoda, K. Okamoto, H. Nat Commun Article Ultrafast electronic-phase change in solids by light, called photoinduced phase transition, is a central issue in the field of non-equilibrium quantum physics, which has been developed very recently. In most of those phenomena, charge or spin orders in an original phase are melted by photocarrier generations, while an ordered state is usually difficult to be created from a non-ordered state by a photoexcitation. Here, we demonstrate that a strong terahertz electric-field pulse changes a Mott insulator of an organic molecular compound in κ-(ET)(2)Cu[N(CN)(2)]Cl (ET = bis(ethylenedithio)tetrathiafulvalene), to a macroscopically polarized charge-order state; herein, electronic ferroelectricity is induced by the collective intermolecular charge transfers in each dimer. In contrast, in an isostructural compound, κ-(ET)(2)Cu(2)(CN)(3), which shows the spin-liquid state at low temperatures, a similar polar charge order is not stabilized by the same terahertz pulse. From the comparative studies of terahertz-field-induced second-harmonic-generation and reflectivity changes in the two compounds, we suggest the possibility that a coupling of charge and spin degrees of freedom would play important roles in the stabilization of polar charge order. Nature Publishing Group UK 2021-02-11 /pmc/articles/PMC7878852/ /pubmed/33574221 http://dx.doi.org/10.1038/s41467-021-20925-x Text en © The Author(s) 2021 Open Access 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. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Yamakawa, H.
Miyamoto, T.
Morimoto, T.
Takamura, N.
Liang, S.
Yoshimochi, H.
Terashige, T.
Kida, N.
Suda, M.
Yamamoto, H. M.
Mori, H.
Miyagawa, K.
Kanoda, K.
Okamoto, H.
Terahertz-field-induced polar charge order in electronic-type dielectrics
title Terahertz-field-induced polar charge order in electronic-type dielectrics
title_full Terahertz-field-induced polar charge order in electronic-type dielectrics
title_fullStr Terahertz-field-induced polar charge order in electronic-type dielectrics
title_full_unstemmed Terahertz-field-induced polar charge order in electronic-type dielectrics
title_short Terahertz-field-induced polar charge order in electronic-type dielectrics
title_sort terahertz-field-induced polar charge order in electronic-type dielectrics
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7878852/
https://www.ncbi.nlm.nih.gov/pubmed/33574221
http://dx.doi.org/10.1038/s41467-021-20925-x
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