Phonon excitation by electron beams in nanographenes
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hdl:2117/79119
Tipus de documentArticle
Data publicació2015-09-30
EditorAPS
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Electron beams have the ability of exciting vibrational modes (phonons) in molecules and nanoclusters,
which can be currently probed with atomic spatial resolution through electron energy-loss spectroscopy (EELS).
This scenario is similar to the excitation of plasmons with light, except that electrons allow much tighter spatial
focusing. Additionally, phonons possess larger quality factors and lifetimes. In an effort to exploit these appealing
properties, we theoretically investigate the interaction of focused electron beams with the vibrational modes of
carbon nanographenes. The EELS probability is found to mimic the density of vibrational states, both of which
evolve smoothly with cluster size towards the limit of extended graphene. Our results support the use of phonons
as long-lived, tightly confined substitutes of plasmons, combined with electron-beam-mediated mode-selective
excitation
ISSN1098-0121
Versió de l'editorhttp://journals.aps.org/prb/pdf/10.1103/PhysRevB.92.115449
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PhysRevB.92.115449.pdf | 852,0Kb | Visualitza/Obre |