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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.

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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