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Title: Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals

Abstract

We report that 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 Sr 1–yMn 1–zSb 2, 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. Lastly, the complex change of refractive index shows that photoexcited carrier populations persist for a few picoseconds.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2];  [2];  [2]; ORCiD logo [2];  [3];  [3]; ORCiD logo [4];  [4];  [5];  [6]; ORCiD logo [7];  [7]
  1. Santa Clara Univ., Santa Clara, CA (United States)
  2. Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami (Japan)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Tulane Univ., New Orleans, LA (United States)
  5. Max Planck Institute for Solid State Research, Stuttgart (Germany)
  6. Max Planck Institute for Solid State Research, Stuttgart (Germany); Ludwig-Maximilians-Universität München (Germany)
  7. Max Planck Institute of Microstructure Physics, Halle (Germany)
Publication Date:
Research Org.:
Louisiana Board of Regents, Baton Rouge, LA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1511153
Alternate Identifier(s):
OSTI ID: 1411990
Grant/Contract Number:  
SC0012432
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 22; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Weber, Chris P., Berggren, Bryan S., Masten, Madison G., Ogloza, Thomas C., Deckoff-Jones, Skylar, Madéo, Julien, Man, Michael K. L., Dani, Keshav M., Zhao, Lingxiao, Chen, Genfu, Liu, Jinyu, Mao, Zhiqiang, Schoop, Leslie M., Lotsch, Bettina V., Parkin, Stuart S. P., and Ali, Mazhar. Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals. United States: N. p., 2017. Web. doi:10.1063/1.5006934.
Weber, Chris P., Berggren, Bryan S., Masten, Madison G., Ogloza, Thomas C., Deckoff-Jones, Skylar, Madéo, Julien, Man, Michael K. L., Dani, Keshav M., Zhao, Lingxiao, Chen, Genfu, Liu, Jinyu, Mao, Zhiqiang, Schoop, Leslie M., Lotsch, Bettina V., Parkin, Stuart S. P., & Ali, Mazhar. Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals. United States. doi:10.1063/1.5006934.
Weber, Chris P., Berggren, Bryan S., Masten, Madison G., Ogloza, Thomas C., Deckoff-Jones, Skylar, Madéo, Julien, Man, Michael K. L., Dani, Keshav M., Zhao, Lingxiao, Chen, Genfu, Liu, Jinyu, Mao, Zhiqiang, Schoop, Leslie M., Lotsch, Bettina V., Parkin, Stuart S. P., and Ali, Mazhar. Fri . "Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals". United States. doi:10.1063/1.5006934. https://www.osti.gov/servlets/purl/1511153.
@article{osti_1511153,
title = {Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals},
author = {Weber, Chris P. and Berggren, Bryan S. and Masten, Madison G. and Ogloza, Thomas C. and Deckoff-Jones, Skylar and Madéo, Julien and Man, Michael K. L. and Dani, Keshav M. and Zhao, Lingxiao and Chen, Genfu and Liu, Jinyu and Mao, Zhiqiang and Schoop, Leslie M. and Lotsch, Bettina V. and Parkin, Stuart S. P. and Ali, Mazhar},
abstractNote = {We report that 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. Lastly, the complex change of refractive index shows that photoexcited carrier populations persist for a few picoseconds.},
doi = {10.1063/1.5006934},
journal = {Journal of Applied Physics},
number = 22,
volume = 122,
place = {United States},
year = {2017},
month = {12}
}

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