Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals

Chris P. Weber, Bryan S. Berggren, Madison G. Masten, Thomas C. Ogloza, Skylar Deckoff-Jones, Julien Madéo, Michael K.L. Man, Keshav M. Dani, Lingxiao Zhao, Genfu Chen, Jinyu Liu, Zhiqiang Mao, Leslie M. Schoop, Bettina V. Lotsch, Stuart S.P. Parkin, Mazhar Ali

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15 Scopus citations

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.

Original languageEnglish (US)
Article number223102
JournalJournal of Applied Physics
Volume122
Issue number22
DOIs
StatePublished - Dec 14 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Weber, C. P., Berggren, B. S., Masten, M. G., Ogloza, T. C., Deckoff-Jones, S., Madéo, J., Man, M. K. L., Dani, K. M., Zhao, L., Chen, G., Liu, J., Mao, Z., Schoop, L. M., Lotsch, B. V., Parkin, S. S. P., & Ali, M. (2017). Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals. Journal of Applied Physics, 122(22), [223102]. https://doi.org/10.1063/1.5006934