Abstract-Impact of higher-order coherences on the carrier dynamics in Landau-quantized graphene

Florian Wendler; Ermin Malic
http://spie.org/Publications/Proceedings/Paper/10.1117/12.2186880

We investigate the carrier dynamics in Landau-quantized graphene within the density matrix formalism. In particular, we focus on the carrier-light interaction addressing the impact of higher-order polarizations beyond the optical selection rules. We find that these terms are in general negligible, however, there are regimes, where they even become crucial for the carrier dynamics. Our calculations show that for short excitation pulses, very small Landau level broadenings, and certain configurations of magnetic field strength, Fermi energy, and excitation energy, higher-order polarizations need to be taken into account.