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dc.contributor.author
Akbari, Kamran
dc.contributor.author
Segui Osorio, Silvina Inda Maria
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dc.contributor.author
Miskovic, Zoran L.
dc.contributor.author
Gervasoni, Juana Luisa
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dc.contributor.author
Arista, Nestor Ricardo
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dc.date.available
2020-10-26T13:44:43Z
dc.date.issued
2018-11
dc.identifier.citation
Akbari, Kamran; Segui Osorio, Silvina Inda Maria; Miskovic, Zoran L.; Gervasoni, Juana Luisa; Arista, Nestor Ricardo; Energy losses and transition radiation in graphene traversed by a fast charged particle under oblique incidence; American Physical Society; Physical Review B; 98; 19; 11-2018; 1-19; 1954
dc.identifier.issn
2469-9969
dc.identifier.uri
http://hdl.handle.net/11336/116785
dc.description.abstract
We perform fully relativistic calculations of the energy loss channels for a charged particle traversing a single layer of graphene under oblique incidence in a setting pertinent to a Scanning Transmission Electron Microscope (STEM), where we distinguish between the energy deposited in graphene in the form of electronic excitations (Ohmic loss) and the energy emitted in the far field in the form of transition radiation (TR). Our formulation of the problem uses a definition of two in-plane, dielectric functions of graphene, which describe the longitudinal and transverse excitation processes that contribute separately to those two energy loss channels. Using several models for the electric conductivity of graphene as the input in those dielectric functions enables us to discuss the effects of oblique incidence on several processes in a broad range of frequencies, from the terahertz (THz) to the ultraviolet (UV). In particular, at the THz frequencies, we demonstrate that the nonlocal effect in the graphene?s conductivity is not important in the retarded regime, and we show that the longitudinal and transverse contributions to the emitted TR spectra exhibit strongly anisotropic angular patterns that are readily distinguishable in a cathodoluminescence measurement in a STEM. Moreover, we explore the possibility of exciting the so-called transverse mode in the optical response of graphene at the mid-infrared (MIR) range of frequencies by means of a fast charged particle under oblique incidence. Finally, we demonstrate that, besides the usual high-energy peaks in the longitudinal contribution to the Ohmic energy loss in the MIR to the UV frequency range, there may arise strongly directional features in the in-plane distribution of the transverse contribution to the Ohmic energy loss for an oblique trajectory, which could be possibly observed via momentum- and angle-resolved electron energy loss spectroscopy of graphene in STEM.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
GRAPHENE
dc.subject
EELS
dc.subject
RETARDATION EFFECTS
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PLASMONS
dc.subject.classification
Física de los Materiales Condensados
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Energy losses and transition radiation in graphene traversed by a fast charged particle under oblique incidence
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-10-15T17:57:31Z
dc.journal.volume
98
dc.journal.number
19
dc.journal.pagination
1-19; 1954
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Washington DC
dc.description.fil
Fil: Akbari, Kamran. University of Waterloo; Canadá
dc.description.fil
Fil: Segui Osorio, Silvina Inda Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Miskovic, Zoran L.. University of Waterloo; Canadá
dc.description.fil
Fil: Gervasoni, Juana Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica; Argentina
dc.description.fil
Fil: Arista, Nestor Ricardo. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica; Argentina
dc.journal.title
Physical Review B
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevB.98.195410
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.195410
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1803.11371
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