Carrier multiplication in graphene under Landau quantization

Florian Wendler (), Andreas Knorr and Ermin Malic
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Florian Wendler: Institute of Theoretical Physics, Nonlinear Optics and Quantum Electronics, Technical University Berlin, Hardenbergstrasse 36
Andreas Knorr: Institute of Theoretical Physics, Nonlinear Optics and Quantum Electronics, Technical University Berlin, Hardenbergstrasse 36
Ermin Malic: Institute of Theoretical Physics, Nonlinear Optics and Quantum Electronics, Technical University Berlin, Hardenbergstrasse 36

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Carrier multiplication is a many-particle process giving rise to the generation of multiple electron-hole pairs. This process holds the potential to increase the power conversion efficiency of photovoltaic devices. In graphene, carrier multiplication has been theoretically predicted and recently experimentally observed. However, due to the absence of a bandgap and competing phonon-induced electron-hole recombination, the extraction of charge carriers remains a substantial challenge. Here we present a new strategy to benefit from the gained charge carriers by introducing a Landau quantization that offers a tunable bandgap. Based on microscopic calculations within the framework of the density matrix formalism, we report a significant carrier multiplication in graphene under Landau quantization. Our calculations reveal a high tunability of the effect via externally accessible pump fluence, temperature and the strength of the magnetic field.

Date: 2014
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DOI: 10.1038/ncomms4703

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