Carrier multiplication and optical gain in graphene

Torben Winzer; Ermin Malic

doi:10.1117/12.2036561

7 March 2014 Carrier multiplication and optical gain in graphene

Torben Winzer, Ermin Malic

Proceedings Volume 8984, Ultrafast Phenomena and Nanophotonics XVIII; 89840L (2014) https://doi.org/10.1117/12.2036561
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We present a microscopic study on the pump fluence dependent carrier relaxation dynamics in optically excited graphene. Our investigation focuses on the particular role of efficient Auger processes on the carrier dynamics in different excitation regimes. It turns out that for low fluence excitations, the carrier generating impact excitation prevails over the Auger recombination resulting in a significant multiplication of optically excited carriers. In contrast, for strong excitations, we show the occurrence of a transient population inversion that quickly decays due to the predominant process of Auger recombination.

Citation Download Citation

Torben Winzer and Ermin Malic "Carrier multiplication and optical gain in graphene", Proc. SPIE 8984, Ultrafast Phenomena and Nanophotonics XVIII, 89840L (7 March 2014); https://doi.org/10.1117/12.2036561

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