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  Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals

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

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Weber, C., Author
Berggren, B., Author
Masten, M., Author
Ogloza, T., Author
Deckoff-Jones, S., Author
Madeo, J., Author
Man, M., Author
Dani, K., Author
Zhao, L., Author
Chen, G., Author
Liu, J.1, Author           
Mao, Z., Author
Schoop, L., Author
Lotsch, B. V.2, Author           
Parkin, S., Author
Ali, M., Author
Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              
2Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370482              

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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. Published by AIP Publishing.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 735174
ISI: 000418349300002
 Degree: -

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Title: Journal of Applied Physics
Source Genre: Journal
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Publ. Info: MELVILLE : AMER INST PHYSICS
Pages: - Volume / Issue: 122 (22) Sequence Number: 223102 Start / End Page: - Identifier: ISSN: 0021-8979