Science Advances

This PDF file includes:

• section S1. Figure caption of movie S1.
  
• section S2. Photon emission from graphene affected by swift electrons.
  
• section S3. Energy spectrum of induced charges on graphene.
  
• section S4. Dispersion relation and propagation length/time of graphene plasmons.
  
• section S5. Analytical EEL spectrum.
  
• section S6. Comparison of EEL spectra between previous work and our result.
  
• section S7. Total energy of emitted photons.
  
• section S8. Numerical implementation with Sommerfeld integration.
  
• fig. S1. Dispersion curve of TM graphene plasmons.
  
• fig. S2. Propagation time of TM graphene plasmons as a function of frequency.
  
• fig. S3. EEL spectrum when an electron normally incident on an ideal lossless graphene layer.
  
• fig. S4. EEL spectra for an electron normally incident on graphene.
  
• References (39–52)

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Other Supplementary Material for this manuscript includes the following:

• movie S1 (.mov format). Time evolution of 2D plasmons launched by swift electrons.