Ultrafast carrier dynamics in the ferromagnetic semimetal EuCd<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

We report the near-infrared pump-probe ultrafast response of the ferromagnetic candidate Weyl semimetal EuCd2As2. A non-pulsewidth limited rise dynamic is followed by two distinct decay processes – a sub-picosecond decay attributed to electron-phonon relaxation and a several picosecond long process which stems from demagnetization of the in-plane magnetic moment. Exponential fits of the decay processes down to 6 K reveal subtle sensitivity to the long-range magnetic ordering. Surprisingly, the strongest effects take place near 80 K despite negligible changes in ARPES. Time-resolved magneto-optical Kerr effect measurements will provide further insight into this critical temperature scale.

*Research presented in this presentation was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number E1TT.

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Presenters

  • Ken ONeal

    • Los Alamos National Laboratory
    • Department of Chemistry, University of Tennessee
    • CINT, Los Alamos National Lab

Authors

  • Ken ONeal

    • Los Alamos National Laboratory
    • Department of Chemistry, University of Tennessee
    • CINT, Los Alamos National Lab

  • Prashant Padmanabhan

    • Los Alamos National Laboratory
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • La Moyne Mix

    • Los Alamos National Laboratory
    • CINT, Los Alamos National Lab

  • Min Cheol Lee

    • Los Alamos National Laboratory
    • CINT, Los Alamos National Lab

  • Nicholas Sirica

    • Los Alamos National Laboratory
    • CINT, Los Alamos National Lab

  • Brinda Kuthanazhi

    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory/Iowa State University

  • Sergey L. Bud'ko

    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory, U.S. Department of Energy, and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory/Iowa State University

  • Paul C Canfield

    • Iowa State University/ Ames Laboratory
    • Ames Laboratory
    • Ames Laboratory, Iowa State University
    • Iowa State University
    • Ames Lab/Iowa State
    • Ames Laboratory, Ames, IA
    • Iowa State University/AmesLab
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, U.S. Department of Energy, and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory/Iowa State University

  • Rohit P Prasankumar

    • Los Alamos National Laboratory
    • CINT, Los Alamos National Lab
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Dmitry Yarotski

    • Los Alamos National Laboratory
    • CINT, Los Alamos National Lab
    • Department of Physics, Massachusetts Institute of Technology
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory