Caustic graphene plasmons with Kelvin angle
| Autor: | Zhaoju Yang, Fei Gao, Xiao Lin, Hongyi Xu, Baile Zhang, Xihang Shi |
|---|---|
| Přispěvatelé: | School of Physical and Mathematical Sciences, Centre for Disruptive Photonic Technologies (CDPT) |
| Rok vydání: | 2015 |
| Předmět: |
Physics::Optics
FOS: Physical sciences Electron Mach wave Electromagnetic radiation law.invention symbols.namesake Optics law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Physics::Atomic and Molecular Clusters Plasmon Physics Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics business.industry Graphene Physics and Applied Physics Condensed Matter Physics Charged particle Physics - Plasma Physics Electronic Optical and Magnetic Materials Plasma Physics (physics.plasm-ph) Mach number symbols Caustic (optics) business |
| DOI: | 10.48550/arxiv.1505.02848 |
| Popis: | A century-long argument made by Lord Kelvin that all swimming objects have an effective Mach number of 3, corresponding to the Kelvin angle of 19.5 degree for ship waves, has been recently challenged with the conclusion that the Kelvin angle should gradually transit to the Mach angle as the ship velocity increases. Here we show that a similar phenomenon can happen for graphene plasmons. By analyzing the caustic wave pattern of graphene plasmons stimulated by a swift charged particle moving uniformly above graphene, we show that at low velocities of the charged particle, the caustics of graphene plasmons form the Kelvin angle. At large velocities of the particle, the caustics disappear and the effective semi-angle of the wave pattern approaches the Mach angle. Our study introduces caustic wave theory to the field of graphene plasmonics, and reveals a novel physical picture of graphene plasmon excitation during electron energy-loss spectroscopy measurement. Comment: 15 pages, 4 figures |
| Databáze: | OpenAIRE |
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