Nanoscale momentum-resolved vibrational spectroscopy.

Nanoscale momentum-resolved vibrational spectroscopy.
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DOI:
10.1126/sciadv.aar7495
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发表时间:
2018-06
期刊:
影响因子:
13.6
通讯作者:
Ramasse QM
Ramasse QM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hage FS;Nicholls RJ;Yates JR;McCulloch DG;Lovejoy TC;Dellby N;Krivanek OL;Refson K;Ramasse QM

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A widely applicable method for accessing phonon dispersions of materials at high spatial resolution is demonstrated. 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.
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