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  Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals

Weber, C. P., Berggren, B. S., Masten, M. G., Ogloza, T. C., Deckoff-Jones, S., Madéo, J., et al. (2017). Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals. Journal of Applied Physics, 122(22): 223102. doi:10.1063/1.5006934.

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https://doi.org/10.1063/1.5006934 (Publisher version)
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 Creators:
Weber, Chris P.1, Author
Berggren, Bryan S.1, Author
Masten, Madison G.1, Author
Ogloza, Thomas C.1, Author
Deckoff-Jones, Skylar1, Author
Madéo, Julien1, Author
Man, Michael K. L.1, Author
Dani, Keshav M.1, Author
Zhao, Lingxiao1, Author
Chen, Genfu1, Author
Liu, Jinyu1, Author
Mao, Zhiqiang1, Author
Schoop, Leslie M.1, Author
Lotsch, Bettina V.1, Author
Parkin, Stuart S. P.2, Author              
Ali, Mazhar2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              

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 Abstract: Recent years have seen the rapid discovery of solids whose low-energy electrons have a massless, linear dispersion, such as Weyl, line-node, and Dirac semimetals. The remarkable optical properties predicted in these materials show their versatile potential for optoelectronic uses. However, little is known of their response in the picoseconds after absorbing a photon. Here, we measure the ultrafast dynamics of four materials that share non-trivial band structure topology but that differ chemically, structurally, and in their low-energy band structures: ZrSiS, which hosts a Dirac line node and Dirac points; TaAs and NbP, which are Weyl semimetals; and Sr1–yMn1–zSb2, in which Dirac fermions coexist with broken time-reversal symmetry. After photoexcitation by a short pulse, all four relax in two stages, first sub-picosecond and then few-picosecond. Their rapid relaxation suggests that these and related materials may be suited for optical switches and fast infrared detectors. The complex change of refractive index shows that photoexcited carrier populations persist for a few picoseconds.

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 Dates: 2017-12-082017-12-14
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: P13130
DOI: 10.1063/1.5006934
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Title: Journal of Applied Physics
  Abbreviation : J. Appl. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : AIP Publishing
Pages: - Volume / Issue: 122 (22) Sequence Number: 223102 Start / End Page: - Identifier: ISSN: 0021-8979
CoNE: https://pure.mpg.de/cone/journals/resource/991042723401880