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Nanoscale momentum-resolved vibrational spectroscopy.
Science Advances ( IF 13.6 ) Pub Date : 2018-Jun-01 , DOI: 10.1126/sciadv.aar7495
Fredrik S. Hage 1 , Rebecca J. Nicholls 2 , Jonathan R. Yates 2 , Dougal G. McCulloch 3 , Tracy C. Lovejoy 4 , Niklas Dellby 4 , Ondrej L. Krivanek 4, 5 , Keith Refson 6, 7 , Quentin M. Ramasse 1, 8, 9
Affiliation  

Vibrational modes affect fundamental physical properties such as the conduction of sound and heat and can be sensitive to nano- and atomic-scale structure. Probing the momentum transfer dependence of vibrational modes provides a wealth of information about a materials system; however, experimental work has been limited to essentially bulk and averaged surface approaches or to small wave vectors. We demonstrate a combined experimental and theoretical methodology for nanoscale mapping of optical and acoustic phonons across the first Brillouin zone, in the electron microscope, probing a volume ~1010 to 1020 times smaller than that of comparable bulk and surface techniques. In combination with more conventional electron microscopy techniques, the presented methodology should allow for direct correlation of nanoscale vibrational mode dispersions with atomic-scale structure and chemistry.

中文翻译:

纳米级动量分辨振动光谱。

振动模式会影响基本的物理属性,例如声音和热量的传导,并且可能对纳米级和原子级结构敏感。探究振动模式的动量传递依赖性可提供有关材料系统的大量信息。然而,实验工作仅限于大体和平均的表面方法或小波矢。我们展示了一种结合实验和理论的方法,可在电子显微镜下对整个布里渊区的光学和声学声子进行纳米级映射,探测的体积约为10 10至10 20比同类散装和表面技术小三倍。与更常规的电子显微镜技术相结合,提出的方法应允许纳米级振动模式分散体与原子级结构和化学性质直接相关。
更新日期:2018-06-16
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