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Photo-induced edge states in low dimensional materials have attractedconsiderable attention due to the tunability of topological properties anddispersion. Specifically, graphene nanoribbons have been predicted to hostchiral edge modes upon irradiation with circularly polarized light. Here, wepresent numerical calculations of time-resolved angle resolved photoemissionspectroscopy (trARPES) and time-resolved resonant inelastic x-ray scattering(trRIXS) of a graphene nanoribbon. We characterize pump-probe spectroscopicsignatures of photo-induced edge states, illustrate the origin of distinctspectral features that arise from Floquet topological edge modes, andinvestigate the roles of incoming photon energies and finite core-hole lifetimein RIXS. With momentum, energy, and time resolution, pump-probe spectroscopiescan play an important role in understanding the behavior of photo-inducedtopological states of matter.

Observing photo-induced chiral edge states of graphene nanoribbons in pump-probe spectroscopies