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Topological phonons and phase transition mechanism in ferroelectric HfO2.

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Title: Topological phonons and phase transition mechanism in ferroelectric HfO2.
Authors: Huang, Jin1,2 (AUTHOR), Liao, Jiajia1,2 (AUTHOR), Yang, Jiangheng1 (AUTHOR), Liao, Min1,2 (AUTHOR) mliao@xidian.edu.cn, Zhou, Yichun1,2 (AUTHOR) yichunzhou@xidian.edu.cn
Source: Acta Mechanica. Feb2026, Vol. 237 Issue 2, p915-924. 10p.
Subjects: Phase transitions, Phonon dispersion relations, Lattice dynamics, Acoustic phonons, Polarization (Electricity), Hafnium oxide films
Abstract: The study of topological behavior, which originally developed based on the electron as a particle, has rapidly extended to the field of electromagnetic and acoustical/elastic waves due to the similarity of the wave function. Phonons, as quasi-particles collectively excited by the crystal structures, play a crucial role in understanding the quantum behavior of materials as well as the interaction between topological mechanics and ferroelectric polarization. In this paper, we have developed a one-dimensional diatomic spring–mass model based on the real material (ferroelectric hafnium oxide) and then investigated its dispersion spectroscopy, including the wave-like properties of its vibrations and the phonon topological behavior, at both classical mechanics and quantum mechanics levels. The results demonstrate that in this material, the structural phase transition process of polarization switching is accompanied by a topological phase transition based on the X2-mode reversal mechanism and undergoing the intermediate T phase. Our study serves as an essential guide for modulating the properties of ferroelectrics and designing new functional devices from the perspective of topological mechanics and phonons. [ABSTRACT FROM AUTHOR]
Copyright of Acta Mechanica is the property of Springer Nature 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.)
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  Data: <searchLink fieldCode="JN" term="%22Acta+Mechanica%22">Acta Mechanica</searchLink>. Feb2026, Vol. 237 Issue 2, p915-924. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Phonon+dispersion+relations%22">Phonon dispersion relations</searchLink><br /><searchLink fieldCode="DE" term="%22Lattice+dynamics%22">Lattice dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustic+phonons%22">Acoustic phonons</searchLink><br /><searchLink fieldCode="DE" term="%22Polarization+%28Electricity%29%22">Polarization (Electricity)</searchLink><br /><searchLink fieldCode="DE" term="%22Hafnium+oxide+films%22">Hafnium oxide films</searchLink>
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  Data: The study of topological behavior, which originally developed based on the electron as a particle, has rapidly extended to the field of electromagnetic and acoustical/elastic waves due to the similarity of the wave function. Phonons, as quasi-particles collectively excited by the crystal structures, play a crucial role in understanding the quantum behavior of materials as well as the interaction between topological mechanics and ferroelectric polarization. In this paper, we have developed a one-dimensional diatomic spring–mass model based on the real material (ferroelectric hafnium oxide) and then investigated its dispersion spectroscopy, including the wave-like properties of its vibrations and the phonon topological behavior, at both classical mechanics and quantum mechanics levels. The results demonstrate that in this material, the structural phase transition process of polarization switching is accompanied by a topological phase transition based on the X2-mode reversal mechanism and undergoing the intermediate T phase. Our study serves as an essential guide for modulating the properties of ferroelectrics and designing new functional devices from the perspective of topological mechanics and phonons. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Mechanica is the property of Springer Nature 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: 10.1007/s00707-025-04278-w
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      – SubjectFull: Hafnium oxide films
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              Text: Feb2026
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