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Photonic axion insulator.

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Title: Photonic axion insulator.
Authors: Gui-Geng Liu, Mandal, Subhaskar, Xiang Xi, Qiang Wang, Devescovi, Chiara, Morales-Pérez, Antonio, Ziyao Wang, Linyun Yang, Banerjee, Rimi, Yang Long, Yan Meng, Peiheng Zhou, Zhen Gao, Yidong Chong, García-Etxarri, Aitzol, Vergniory, Maia G., Baile Zhang
Source: Science (pre-March 2025). 1/10/2025, Vol. 387 Issue 6730, p162-166. 5p. 4 Color Photographs.
Subjects: Hypothetical particles, Particles (Nuclear physics), Phases of matter, Topological property, Photonic crystals, Axions
Abstract: Axions, hypothetical elementary particles that remain undetectable in nature, can arise as quasiparticles in three-dimensional crystals known as axion insulators. Previous implementations of axion insulators have largely been limited to two-dimensional systems, leaving their topological properties in three dimensions unexplored in experiment. Here, we realize an axion insulator in a three-dimensional photonic crystal and probe its topological properties. Demonstrated features include half-quantized Chern numbers on each surface that resembles a fractional Chern insulator, unidirectional chiral hinge states forming topological transport in three dimensions, and arithmetic operations between fractional and integer Chern numbers. Our work experimentally establishes the axion insulator as a three-dimensional topological phase of matter and enables chiral states to form complex, unidirectional three-dimensional networks through braiding. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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DbLabel: Psychology and Behavioral Sciences Collection
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Photonic axion insulator.
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  Data: <searchLink fieldCode="AR" term="%22Gui-Geng+Liu%22">Gui-Geng Liu</searchLink><br /><searchLink fieldCode="AR" term="%22Mandal%2C+Subhaskar%22">Mandal, Subhaskar</searchLink><br /><searchLink fieldCode="AR" term="%22Xiang+Xi%22">Xiang Xi</searchLink><br /><searchLink fieldCode="AR" term="%22Qiang+Wang%22">Qiang Wang</searchLink><br /><searchLink fieldCode="AR" term="%22Devescovi%2C+Chiara%22">Devescovi, Chiara</searchLink><br /><searchLink fieldCode="AR" term="%22Morales-Pérez%2C+Antonio%22">Morales-Pérez, Antonio</searchLink><br /><searchLink fieldCode="AR" term="%22Ziyao+Wang%22">Ziyao Wang</searchLink><br /><searchLink fieldCode="AR" term="%22Linyun+Yang%22">Linyun Yang</searchLink><br /><searchLink fieldCode="AR" term="%22Banerjee%2C+Rimi%22">Banerjee, Rimi</searchLink><br /><searchLink fieldCode="AR" term="%22Yang+Long%22">Yang Long</searchLink><br /><searchLink fieldCode="AR" term="%22Yan+Meng%22">Yan Meng</searchLink><br /><searchLink fieldCode="AR" term="%22Peiheng+Zhou%22">Peiheng Zhou</searchLink><br /><searchLink fieldCode="AR" term="%22Zhen+Gao%22">Zhen Gao</searchLink><br /><searchLink fieldCode="AR" term="%22Yidong+Chong%22">Yidong Chong</searchLink><br /><searchLink fieldCode="AR" term="%22García-Etxarri%2C+Aitzol%22">García-Etxarri, Aitzol</searchLink><br /><searchLink fieldCode="AR" term="%22Vergniory%2C+Maia+G%2E%22">Vergniory, Maia G.</searchLink><br /><searchLink fieldCode="AR" term="%22Baile+Zhang%22">Baile Zhang</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 1/10/2025, Vol. 387 Issue 6730, p162-166. 5p. 4 Color Photographs.
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  Data: <searchLink fieldCode="DE" term="%22Hypothetical+particles%22">Hypothetical particles</searchLink><br /><searchLink fieldCode="DE" term="%22Particles+%28Nuclear+physics%29%22">Particles (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Phases+of+matter%22">Phases of matter</searchLink><br /><searchLink fieldCode="DE" term="%22Topological+property%22">Topological property</searchLink><br /><searchLink fieldCode="DE" term="%22Photonic+crystals%22">Photonic crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Axions%22">Axions</searchLink>
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  Data: Axions, hypothetical elementary particles that remain undetectable in nature, can arise as quasiparticles in three-dimensional crystals known as axion insulators. Previous implementations of axion insulators have largely been limited to two-dimensional systems, leaving their topological properties in three dimensions unexplored in experiment. Here, we realize an axion insulator in a three-dimensional photonic crystal and probe its topological properties. Demonstrated features include half-quantized Chern numbers on each surface that resembles a fractional Chern insulator, unidirectional chiral hinge states forming topological transport in three dimensions, and arithmetic operations between fractional and integer Chern numbers. Our work experimentally establishes the axion insulator as a three-dimensional topological phase of matter and enables chiral states to form complex, unidirectional three-dimensional networks through braiding. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.adr5234
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 162
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        Type: general
      – SubjectFull: Particles (Nuclear physics)
        Type: general
      – SubjectFull: Phases of matter
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      – SubjectFull: Topological property
        Type: general
      – SubjectFull: Photonic crystals
        Type: general
      – SubjectFull: Axions
        Type: general
    Titles:
      – TitleFull: Photonic axion insulator.
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              Text: 1/10/2025
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