Ultrafast nonlinear optical response of Dirac fermions in graphene
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s41467-018-03413-7.pdf
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Checksum (MD5)
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Author(s)
Baudisch, Matthias
Marini, Andrea
Cox, Joel D.
Silva, Francisco
Teichmann, Stephan
Massicotte, Mathieu
Koppens, Frank
García de Abajo, F. Javier
Biegert, Jens
Zhu, Tony
Date Issued
March 2018
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Baudisch, Matthias et al. “Ultrafast Nonlinear Optical Response of Dirac Fermions in Graphene.” Nature Communications 9, 1 (March 2018): 1018 © 2018 The Author(s)
Version
Final published version
Abstract
The speed of solid-state electronic devices, determined by the temporal dynamics of charge carriers, could potentially reach unprecedented petahertz frequencies through direct manipulation by optical fields, consisting in a million-fold increase from state-of-the-art technology. In graphene, charge carrier manipulation is facilitated by exceptionally strong coupling to optical fields, from which stems an important back-action of photoexcited carriers. Here we investigate the instantaneous response of graphene to ultrafast optical fields, elucidating the role of hot carriers on sub-100 fs timescales. The measured nonlinear response and its dependence on interaction time and field polarization reveal the back-action of hot carriers over timescales commensurate with the optical field. An intuitive picture is given for the carrier trajectories in response to the optical-field polarization state. We note that the peculiar interplay between optical fields and charge carriers in graphene may also apply to surface states in topological insulators with similar Dirac cone dispersion relations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/S41467-018-03413-7
