Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. Typical WSe2 flake under the optical microscope with the SNOM tip.
  • Fig. S2. Pump and probe synchronization.
  • Fig. S3. Illumination geometry in our SNOM setup.
  • Fig. S4. Guided modes as a function of relative position between the flake and the incoming beam and polarization.
  • Fig. S5. SNOM images and line profile (at 3 W) under different illumination and collection conditions relative to the slab apex.
  • Fig. S6. SNOM snapshots at different time delays.
  • Fig. S7. Calculated dispersion E(k) map for the multilayer stack with 60-nm-thick WSe2.
  • Fig. S8. Extended view of the calculated dispersion E(k) map.
  • Fig. S9. Dispersion curve for an EP.
  • Fig. S10. Group velocity of EP in WSe2 around the A exciton transition for different longitudinal-transverse splitting.
  • References (44, 45)

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