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  Attosecond optical-field-enhanced carrier injection into the GaAs conduction band

Schlaepfer, F., Lucchini, M., Sato, S., Volkov, M., Kasmi, L., Hartmann, N., et al. (2018). Attosecond optical-field-enhanced carrier injection into the GaAs conduction band. Nature Physics, 14(6), 560-564. doi:10.1038/s41567-018-0069-0.

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 Creators:
Schlaepfer, F.1, Author
Lucchini, M.1, Author
Sato, S.2, Author              
Volkov, M.1, Author
Kasmi, L.1, Author
Hartmann, N.1, Author
Rubio, A.2, Author              
Gallmann, L.1, Author
Keller, U.1, Author
Affiliations:
1Department of Physics, ETH Zurich, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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 Abstract: Resolving the fundamental carrier dynamics induced in solids by strong electric fields is essential for future applications, ranging from nanoscale transistors1,2 to high-speed electro-optical switches3. How fast and at what rate can electrons be injected into the conduction band of a solid? Here, we investigate the sub-femtosecond response of GaAs induced by resonant intense near-infrared laser pulses using attosecond transient absorption spectroscopy. In particular, we unravel the distinct role of intra- versus interband transitions. Surprisingly, we found that despite the resonant driving laser, the optical response during the light–matter interaction is dominated by intraband motion. Furthermore, we observed that the coupling between the two mechanisms results in a significant enhancement of the carrier injection from the valence into the conduction band. This is especially unexpected as the intraband mechanism itself can accelerate carriers only within the same band. This physical phenomenon could be used to control ultrafast carrier excitation and boost injection rates in electronic switches in the petahertz regime.

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Language(s): eng - English
 Dates: 2017-08-142018-02-012018-03-122018-06
 Publication Status: Published in print
 Pages: 5
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41567-018-0069-0
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 14 (6) Sequence Number: - Start / End Page: 560 - 564 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850