Nanoscale momentum-resolved vibrational spectroscopy.

ABSTRACT: 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 sho

SUBMITTER: Hage FS 

PROVIDER: S-EPMC6018998 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature