Nonlinear THz Spectroscopy of the Dirac Semimetal Cd<sub>3</sub>As<sub>2</sub>

ORAL

Abstract

Topological semimetals are materials with linear band touchings in their bulk band structure, resulting in low-energy excitation that behaves like a Weyl or Dirac fermion, resulting in novel electronic properties. Cd3As2, a Dirac topological semimetal, has become a promising candidate for integration into opto-electronic devices due to its chemical stability.  Here we investigate the linear and nonlinear THz response of (112) Cd3As2 thin films grown on (111) GaAs via molecular beam epitaxy (MBE).  We identify the large nonlinear response as stemming from pump-probe processes. We then use THz-pump, THz-probe to measure the temperature-dependent and fluence-dependent relaxation rates of the quasiparticle excitations in this material.

*This work was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331.

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Presenters

  • Rishi Bhandia

    • Johns Hopkins University

Authors

  • Rishi Bhandia

    • Johns Hopkins University

  • David Barbalas

    • Johns Hopkins University

  • Run Xiao

    • Pennsylvania State University

  • Tanya Berry

    • Johns Hopkins University

  • Juan Chamorro

    • Johns Hopkins University

  • Tyrel M McQueen

    • Johns Hopkins University
    • Department of Chemistry, The Johns Hopkins University

  • Nitin Samarth

    • Pennsylvania State University

  • N. P Armitage

    • Johns Hopkins University
    • Johns Hopikns Univ.
    • The Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University