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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 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.

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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