Carrier Dynamics in Graphene: Ultrafast Many‐Particle Phenomena

Graphene is an ideal material to study fundamental Coulomb‐ and phonon‐induced carrier scattering processes. Its remarkable gapless and linear band structure opens up new carrier relaxation channels. In particular, Auger scattering bridging the valence and the conduction band changes the number of c...

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Bibliographic Details
Published inAnnalen der Physik Vol. 529; no. 11
Main Authors Malic, E., Winzer, T., Wendler, F., Brem, S., Jago, R., Knorr, A., Mittendorff, M., König‐Otto, J. C., Plötzing, T., Neumaier, D., Schneider, H., Helm, M., Winnerl, S.
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 01.11.2017
Subjects
Augers
Band structure of solids
carrier dynamics
carrier multiplication
Conduction bands
Current carriers
Graphene
Multiplication
Population inversion
Scattering
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Summary:Graphene is an ideal material to study fundamental Coulomb‐ and phonon‐induced carrier scattering processes. Its remarkable gapless and linear band structure opens up new carrier relaxation channels. In particular, Auger scattering bridging the valence and the conduction band changes the number of charge carriers and gives rise to a significant carrier multiplication ‐ an ultrafast many‐particle phenomenon that is promising for the design of highly efficient photodetectors. Furthermore, the vanishing density of states at the Dirac point combined with ultrafast phonon‐induced intraband scattering results in an accumulation of carriers and a population inversion suggesting the design of graphene‐based terahertz lasers. Here, we review our work on the ultrafast carrier dynamics in graphene and Landau‐quantized graphene is presented providing a microscopic view on the appearance of carrier multiplication and population inversion. The feature article presents a review of the recent theoretical work, providing a microscopic view of the time‐ and energy‐resolved dynamics of optically excited carriers in graphene. The remarkable gapless and linear band structure of graphene opens up new relaxation channels, giving rise to fascinating ultrafast phenomena. In this work, the authors focus on the appearance of technologially relevant carrier multiplication and population inversion.
ISSN:0003-3804
1521-3889
1521-3889
DOI:10.1002/andp.201700038