Ultrafast nanoimaging of the order parameter in a structural phase transition

doi:10.1126/science.abd2774

GSTDTAP > 气候变化

DOI	10.1126/science.abd2774
	Ultrafast nanoimaging of the order parameter in a structural phase transition
	Thomas Danz; Till Domröse; Claus Ropers
	2021-01-22
发表期刊	Science
出版年	2021
英文摘要	The layered material 1 T -polytype of tantalum disulfide has several intricate charge-ordered phases. How exactly one phase transitions into another is tricky to observe directly with current technologies. Danz et al. used pump-probe ultrafast dark-field electron microscopy to follow such a transition with fine spatial and temporal resolution (see the Perspective by Kogar). To achieve that goal, they shaped the electron beam used as the probe to bring out the features peculiar to the transition. Science , this issue p. [371][1]; see also p. [341][2] Understanding microscopic processes in materials and devices that can be switched by light requires experimental access to dynamics on nanometer length and femtosecond time scales. Here, we introduce ultrafast dark-field electron microscopy to map the order parameter across a structural phase transition. We use ultrashort laser pulses to locally excite a 1 T- TaS2 (1 T -polytype of tantalum disulfide) thin film and image the transient state of the specimen by ultrashort electron pulses. A tailored dark-field aperture array allows us to track the evolution of charge-density wave domains in the material with simultaneous femtosecond temporal and 5-nanometer spatial resolution, elucidating relaxation pathways and domain wall dynamics. The distinctive benefits of selective contrast enhancement will inspire future beam-shaping technology in ultrafast transmission electron microscopy. [1]: /lookup/doi/10.1126/science.abd2774 [2]: /lookup/doi/10.1126/science.abf1406
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/312362
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Thomas Danz,Till Domröse,Claus Ropers. Ultrafast nanoimaging of the order parameter in a structural phase transition[J]. Science,2021.
APA	Thomas Danz,Till Domröse,&Claus Ropers.(2021).Ultrafast nanoimaging of the order parameter in a structural phase transition.Science.
MLA	Thomas Danz,et al."Ultrafast nanoimaging of the order parameter in a structural phase transition".Science (2021).