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Phase ordering of charge density waves traced by ultrafast low-energy electron diffraction
Nature Physics ( IF 19.6 ) Pub Date : 2017-11-06 , DOI: 10.1038/nphys4309
S. Vogelgesang , G. Storeck , J. G. Horstmann , T. Diekmann , M. Sivis , S. Schramm , K. Rossnagel , S. Schäfer , C. Ropers

We introduce ultrafast low-energy electron diffraction (ULEED) in backscattering for the study of structural dynamics at surfaces. Using a tip-based source of ultrashort electron pulses, we investigate the optically driven transition between charge density wave phases at the surface of 1T-TaS2. The large transfer width of the instrument allows us to employ spot-profile analysis, resolving the phase-ordering kinetics in the nascent incommensurate charge density wave phase. We observe a coarsening that follows a power-law scaling of the correlation length, driven by the annihilation of dislocation-type topological defects of the charge-ordered lattice. Our work opens up the study of a wide class of structural transitions and ordering phenomena at surfaces and in low-dimensional systems.



中文翻译:

超快速低能电子衍射追踪的电荷密度波的相序

我们在背向散射中引入超快低能电子衍射(ULEED),以研究表面的结构动力学。使用基于尖端的超短电子脉冲源,我们研究了1T-TaS 2表面电荷密度波相之间的光学驱动跃迁。仪器的大传输宽度使我们能够进行斑点轮廓分析,从而解决了新生的不相称电荷密度波相中的相序动力学。我们观察到粗化遵循相关长度的幂律定标,由电荷排序晶格的位错型拓扑缺陷的driven灭驱动。我们的工作开启了对表面和低维系统中的各种结构过渡和有序现象的研究。

更新日期:2017-11-06
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