Oct 14 – 15, 2021
Europe/Rome timezone

Coulomb scattering dynamics in graphene investiugated by polarization sensitive pump-probe spectroscopy

Oct 15, 2021, 11:25 AM


Stephan Winnerl (Spectroscopy Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Germany)


We investigate the carrier dynamics in graphene utilizing the free-electron laser FELBE as a source of low-energy photons. Polarization resolved pump-probe experiments with linearly polarized radiation allow us to disentangle the role of electron-electron scattering and scattering of electrons with optical phonons. Applying magnetic fields perpendicular to the graphene layers results in a non-equidistant Landau ladder. Pump-probe experiments with circularly polarized radiation can address individual transitions. We find evidence for strong Auger scattering and discuss the implication for potential graphene-based Landau-level lasers.

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