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 for 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 sensitivity to the long range magnetic ordering. These findings indicate strong coupling between charge and spin degrees of freedom, a step towards magnetic field or light control of topological Weyl states.

*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

  • Kenneth O'Neal

    • University of Tennessee, Knoxville
    • Los Alamos National Laboratory

Authors

  • Kenneth O'Neal

    • University of Tennessee, Knoxville
    • Los Alamos National Laboratory

  • LaMoyne Tyler Mix

    • Los Alamos National Laboratory

  • Min-Cheol Lee

    • Los Alamos National Laboratory

  • Brinda Kuthanazhi

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

  • Na Hyun Jo

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

  • Sergey L. Bud'ko

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy

  • Paul C Canfield

    • Iowa State University
    • Ames Laboratory and Iowa State University
    • Ames Lab
    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames laboratory, Ames, IA
    • Ames Laboratory, Iowa State University
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University, Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University
    • Division of Materials Sciences & Engineering, Ames Lab and Iowa State University
    • Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy
    • Iowa State University/Ames Laboratory

  • Rohit P Prasankumar

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

  • Dzmitry Yarotski

    • Los Alamos National Laboratory