Trimerization-induced zone-folded phonons in 1<i>T</i>′-TaTe2

The trimerized state is an intriguing structure in the superlattice with three unit cells distorted periodically. Here, we report on two kinds of featured phonon modes induced by the trimerization transition in 1T′-TaTe2. One is the almost temperature-independent zone-folded mode, stemming from the collective excitation due to the superlattice formation and the other is the normal mode with the step-like temperature-dependent intensity and frequency, which is the characteristic of the first-order transition of the trimerization. Furthermore, the trimerization can be totally suppressed when Mo-dopant content is less than 6 at. %. Our work not only unveils the featured phonon modes in trimerized system but also provides a pathway to identify the multimerization transition in solids by Raman spectroscopy.

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Publication Details

Journal
Applied Physics Letters
Published
2024-11-04
DOI
https://doi.org/10.1063/5.0232762
Primary Topic
2D Materials and Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Trimerization-induced zone-folded phonons in 1T′-TaTe2

Zhicheng Zhong, Xiaoxiang Xi, Fengqi Song, Fucong Fei et al.
Applied Physics Letters
2D Materials and Applications
article

Trimerization-induced zone-folded phonons in 1T′-TaTe2

Zhicheng Zhong, Xiaoxiang Xi, Fengqi Song, Fucong Fei, Heng Zhang, Tianyu Qiu, Tongshuai Zhu, Chong Zhang, Xuefeng Wang, Yiying Zhang, Yong Zhang
article en

Abstract

The trimerized state is an intriguing structure in the superlattice with three unit cells distorted periodically. Here, we report on two kinds of featured phonon modes induced by the trimerization transition in 1T′-TaTe2. One is the almost temperature-independent zone-folded mode, stemming from the collective excitation due to the superlattice formation and the other is the normal mode with the step-like temperature-dependent intensity and frequency, which is the characteristic of the first-order transition of the trimerization. Furthermore, the trimerization can be totally suppressed when Mo-dopant content is less than 6 at. %. Our work not only unveils the featured phonon modes in trimerized system but also provides a pathway to identify the multimerization transition in solids by Raman spectroscopy.

Applied Physics LettersVol. 125(19)
Suzhou University of Science and Technology (CN), Collaborative Innovation Center of Advanced Microstructures (CN), China University of Petroleum, East China (CN), Nanjing University (CN)
National Natural Science Foundation of China, Natural Science Foundation of Jiangsu Province, National Key Research and Development Program of China, Fundamental Research Funds for the Central Universities
Openalex Percentile: Top 88%
2D Materials and Applications
DOISourceOpenAlex
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Trimerization-induced zone-folded phonons in 1<i>T</i>′-TaTe2 — Zhicheng Zhong, Xiaoxiang Xi, et al. · Applied Physics Letters (2024) | TGRS Research Map | TGRS