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Symmetry-Breaking Supercollisions in Landau-Quantized Graphene
Florian Wendler1, Martin Mittendorff2,3, Jacob C König-Otto3,4
1Department of Theoretical Physics, Technical University Berlin, 10623 Berlin, Germany.
Abstract:
Recent pump-probe experiments performed on graphene in a perpendicular magnetic field have revealed carrier relaxation times ranging from picoseconds to nanoseconds depending on the quality of the sample. To explain this surprising behavior, we propose a novel symmetry-breaking defect-assisted relaxation channel. This enables scattering of electrons with single out-of-plane phonons, which drastically accelerate the carrier scattering time in low-quality samples. The gained insights provide a strategy for tuning the carrier relaxation time in graphene and related materials by orders of magnitude.
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