Visualizing slow internal relaxations in a two-dimensional glassy system

doi:10.1038/s41567-023-02016-4

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	Visualizing slow internal relaxations in a two-dimensional glassy system
	Chen, Yanshuang 1; Ye, Zefang ; Wang, Kexin ; Huang, Jiping ; Tong, Hua 2; Jin, Yuliang 3; Chen, Ke 4; Tanaka, Hajime 5,6; Tan, Peng 1
刊名	NATURE PHYSICS
	2023
卷号	19 期号:7 页码:969+
关键词	AMORPHOUS ORDER DYNAMICS TRANSITION
ISSN号	1745-2473
DOI	10.1038/s41567-023-02016-4
英文摘要	Glasses relax internally even when their structure is frozen. Observations of a two-dimensional glass former now show that although structure relaxation freezes with the glass transition, non-constrained bonds survive; this accounts for persisting internal relaxation. Unlike a crystal, a glassy solid state displays slow internal relaxation processes besides vibrational modes even when structural (alpha) relaxation is frozen. The precise nature of such residual local relaxation modes remains poorly understood due to the lack of real-space information. Here we directly visualize the internal relaxations in a glass via a long-time observation of the dynamics of a mechanically driven two-dimensional granular system that shows a pinning-induced transition. This allows directly visualizing the internal relaxations in a glass. On approaching the glass transition, vanishing cage-breaking motion is observed, accompanied by the emergence of a restricted dynamic mode characterizing slow beta relaxation. The emergence of bond rigidity freezes the structure relaxation and leads to slow beta motion. Our findings indicate that unlike crystallization, where all the bonds are constrained, vitrification in a disordered system freezes alpha relaxation and accompanies elastic percolation, but the remaining non-constrained bonds provide room for slow beta relaxation.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/28108]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai, Peoples R China 2.Fudan Univ, Inst Nanoelect Devices & Quantum Comp, Shanghai, Peoples R China 3.Univ Sci & Technol China, Dept Phys, Hefei, Peoples R China 4.Chinese Acad Sci, Inst Theoret Phys, Beijing, Peoples R China 5.Chinese Acad Sci, Inst Phys, Beijing, Peoples R China 6.Univ Tokyo, Res Ctr Adv Sci & Technol, Meguro Ku, Tokyo, Japan 7.Univ Tokyo, Inst Ind Sci, Dept Fundamental Engn, Meguro Ku, Tokyo, Japan
推荐引用方式 GB/T 7714	Chen, Yanshuang,Ye, Zefang,Wang, Kexin,et al. Visualizing slow internal relaxations in a two-dimensional glassy system[J]. NATURE PHYSICS,2023,19(7):969+.
APA	Chen, Yanshuang.,Ye, Zefang.,Wang, Kexin.,Huang, Jiping.,Tong, Hua.,...&Tan, Peng.(2023).Visualizing slow internal relaxations in a two-dimensional glassy system.NATURE PHYSICS,19(7),969+.
MLA	Chen, Yanshuang,et al."Visualizing slow internal relaxations in a two-dimensional glassy system".NATURE PHYSICS 19.7(2023):969+.