Radiative damping and synchronization in a graphene-based terahertz emitter

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We investigate the collective electron dynamics in a recently proposed graphene-based terahertz emitter under the influence of the radiative damping effect, which is included self-consistently in a molecular dynamics approach. We show that under appropriate conditions synchronization of the dynamics of single electrons takes place, leading to a rise of the oscillating component of the charge current. The synchronization time depends dramatically on the applied dc electric field and electron scattering rate and is roughly inversely proportional to the radiative damping rate that is determined by the carrier concentration and the geometrical parameters of the device. The emission spectra in the synchronized state, determined by the oscillating current component, are analyzed. The effective generation of higher harmonics for large values of the radiative damping strength is demonstrated. (C) 2014 AIP Publishing LLC.
Publisher
AMER INST PHYSICS
Issue Date
2014-05
Language
English
Article Type
Article
Citation

JOURNAL OF APPLIED PHYSICS, v.115, no.20

ISSN
0021-8979
DOI
10.1063/1.4879901
URI
http://hdl.handle.net/10203/261892
Appears in Collection
PH-Journal Papers(저널논문)
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