Caustic graphene plasmons with Kelvin angle
arXiv:1505.02848 · doi:10.1103/PhysRevB.92.081404
Abstract
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.
15 pages, 4 figures
References in corpus (8)
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Cited by in corpus (10)
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- Controlling Cherenkov angles with resonance transition radiation
- A perspective of twisted photonic structures
- A hydrodynamic model approach to the formation of plasmonic wakes in graphene
- Kelvin-Mach wake in a two-dimensional Fermi sea
- Excitation of ship waves by a submerged object: new solution to the classical problem
- Asymmetric Cherenkov Emission in a Topological Plasmonic Waveguide
- Reversed Cherenkov-transition radiation in a waveguide partly filled with an anisotropic dispersive medium
- Superlight inverse Doppler effect
- Shaping non-reciprocal caustic spin-wave beams