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Topological charge transport by mobile dielectric-ferroelectric domain walls

The concept of topology has been widely applied in condensed matter physics, leading to the identification of peculiar electronic states on three-dimensional (3D) surfaces or 2D lines separating topologically distinctive regions. In the systems explored so far, the topological boundaries are built-i...

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Detalles Bibliográficos
Autores principales: Takehara, R., Sunami, K., Miyagawa, K., Miyamoto, T., Okamoto, H., Horiuchi, S., Kato, R., Kanoda, K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6858255/
https://www.ncbi.nlm.nih.gov/pubmed/31763453
http://dx.doi.org/10.1126/sciadv.aax8720
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author Takehara, R.
Sunami, K.
Miyagawa, K.
Miyamoto, T.
Okamoto, H.
Horiuchi, S.
Kato, R.
Kanoda, K.
author_facet Takehara, R.
Sunami, K.
Miyagawa, K.
Miyamoto, T.
Okamoto, H.
Horiuchi, S.
Kato, R.
Kanoda, K.
author_sort Takehara, R.
collection PubMed
description The concept of topology has been widely applied in condensed matter physics, leading to the identification of peculiar electronic states on three-dimensional (3D) surfaces or 2D lines separating topologically distinctive regions. In the systems explored so far, the topological boundaries are built-in walls; thus, their motional degrees of freedom, which potentially bring about new paradigms, have been experimentally inaccessible. Here, working with a quasi-1D organic material with a charge-transfer instability, we show that mobile neutral-ionic (dielectric-ferroelectric) domain boundaries with topological charges carry strongly 1D-confined and anomalously large electrical conduction with an energy gap much smaller than the one-particle excitation gap. This consequence is further supported by nuclear magnetic resonance detection of spin solitons, which are required for steady current of topological charges. The present observation of topological charge transport may open a new channel for broad charge transport–related phenomena such as thermoelectric effects.
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spelling pubmed-68582552019-11-22 Topological charge transport by mobile dielectric-ferroelectric domain walls Takehara, R. Sunami, K. Miyagawa, K. Miyamoto, T. Okamoto, H. Horiuchi, S. Kato, R. Kanoda, K. Sci Adv Research Articles The concept of topology has been widely applied in condensed matter physics, leading to the identification of peculiar electronic states on three-dimensional (3D) surfaces or 2D lines separating topologically distinctive regions. In the systems explored so far, the topological boundaries are built-in walls; thus, their motional degrees of freedom, which potentially bring about new paradigms, have been experimentally inaccessible. Here, working with a quasi-1D organic material with a charge-transfer instability, we show that mobile neutral-ionic (dielectric-ferroelectric) domain boundaries with topological charges carry strongly 1D-confined and anomalously large electrical conduction with an energy gap much smaller than the one-particle excitation gap. This consequence is further supported by nuclear magnetic resonance detection of spin solitons, which are required for steady current of topological charges. The present observation of topological charge transport may open a new channel for broad charge transport–related phenomena such as thermoelectric effects. American Association for the Advancement of Science 2019-11-15 /pmc/articles/PMC6858255/ /pubmed/31763453 http://dx.doi.org/10.1126/sciadv.aax8720 Text en Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Takehara, R.
Sunami, K.
Miyagawa, K.
Miyamoto, T.
Okamoto, H.
Horiuchi, S.
Kato, R.
Kanoda, K.
Topological charge transport by mobile dielectric-ferroelectric domain walls
title Topological charge transport by mobile dielectric-ferroelectric domain walls
title_full Topological charge transport by mobile dielectric-ferroelectric domain walls
title_fullStr Topological charge transport by mobile dielectric-ferroelectric domain walls
title_full_unstemmed Topological charge transport by mobile dielectric-ferroelectric domain walls
title_short Topological charge transport by mobile dielectric-ferroelectric domain walls
title_sort topological charge transport by mobile dielectric-ferroelectric domain walls
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6858255/
https://www.ncbi.nlm.nih.gov/pubmed/31763453
http://dx.doi.org/10.1126/sciadv.aax8720
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