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Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals

Authors :
Mazhar N. Ali
Leslie M. Schoop
Lingxiao Zhao
Keshav M. Dani
Julien Madéo
Bettina V. Lotsch
Zhiqiang Mao
Bryan Berggren
Stuart S. P. Parkin
Skylar Deckoff-Jones
Genfu Chen
Chris Weber
Michael K. L. Man
Thomas C. Ogloza
Madison G. Masten
Jinyu Liu
Source :
Journal of Applied Physics
Publication Year :
2017
Publisher :
AIP Publishing, 2017.

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.

Details

ISSN :
10897550 and 00218979
Volume :
122
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi.dedup.....545400d5051443476a00c6272a44f28c
Full Text :
https://doi.org/10.1063/1.5006934