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Addressing plasmonic and vibrational excitations in Nanoscale Systems with EELS

AuthorsAizpurua, Javier
Issue Date4-Sep-2019
CitationFEMMS (2019)
AbstractIn this contribution, a few cases will be presented where EELS of nanoscale systems is found to provide very relevant information on the nature and properties of polaritonic excitations, with an emphasis on the theoretical description that correctly interprets the spectral fingerprints. First, a system of nanoscale metallic clusters will be presented, where the atomistic details of the clusters are shown to govern the properties of their collective surface plasmon resonances. A comparison between classical and fully quantum mechanical approaches serves to identify atomic-scale features in such nanoparticles and to understand optoelectronic properties within nanogaps. Secondly, we will turn our attention to vibrational excitations in films of Van der Waals materials made of hexagonal Boron Nitride (h-BN), where a complete study of the phonon polaritons driven in nanofilms allow for interpreting the existence of special bulk modes, wave-guided modes, and edge modes driven in these novel nanomaterials. Finally, a study of the effect of temperature and the phonon population of the environment on the properties of the zero-loss peak in EELS is theoretically analyzed in order to interpret experimental data.
DescriptionTrabajo presentado en Frontiers of Electron Microscopy and Materials Science (FEMMS), International Conference, celebrado en Asheville, North Carolina (Estados Unidos), del 1 al 6 de septiembre de 2019
Appears in Collections:(CFM) Comunicaciones congresos
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