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  Photoinduced ultrafast transition of the correlated local structure in chalcogenide phase-change materials

Qi, Y., Chen, N., Vasileiadis, T., Zahn, D., Seiler, H., Li, X., et al. (in preparation). Photoinduced ultrafast transition of the correlated local structure in chalcogenide phase-change materials.

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2109.05705.pdf (Preprint), 3MB
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 Creators:
Qi, Yingpeng1, 2, Author           
Chen, Nianke3, Author
Vasileiadis, Thomas1, Author           
Zahn, Daniela1, Author           
Seiler, Helene1, Author           
Li, Xianbin3, Author
Ernstorfer, Ralph1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Center for Ultrafast Science and Technology, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240 Shanghai, China, ou_persistent22              
3State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci
 Abstract: Revealing the bonding and time-evolving atomic dynamics in functional materials with complex lattice structures can update the fundamental knowledge on rich physics therein, and also help to manipulate the material properties as desired. As the most prototypical chalcogenide phase change material, Ge2Sb2Te5 has been widely used in optical data storage and non-volatile electric memory due to the fast switching speed and the low energy consumption. However, the basic understanding of the structural dynamics on the atomic scale is still not clear. Using femtosecond electron diffraction and TDDFT-MD simulation, we reveal the photoinduced ultrafast transition of the correlated local structure in the averaged rock-salt phase of Ge2Sb2Te5. The ultrafast suppression of the local Peierls distortions gives rise to a local structure change from the rhombohedral to the cubic geometry within ~ 0.3 ps. Our work provides new microscopic insights into contributions of the correlated local structure to the transient structural and optical responses in phase change materials. Moreover, we stress the significance of femtosecond electron diffraction in revealing the correlated local structure in the subunit cell and the link between the correlated disorder and physical properties in functional materials with complex microstructures.

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Language(s): eng - English
 Dates: 2021-09-13
 Publication Status: Not specified
 Pages: 21
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2109.05705
 Degree: -

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