Energy Dependence of the Circular Photogalvanic Effect in the Weyl Semimetal NbIrTe4

ORAL

Abstract

We have investigated the Circular Photogalvanic Effect (CPGE) in the orthorhombic ternary compound, NbIrTe4. This material has been suggested theoretically as a type-II Weyl semimetal having 8 pairs of Weyl nodes, but no ARPES measurements have been published as yet. Measuring the photoresponse of a device fabricated from a thin film of this material (~100 nm thickness) under (0.3-1) eV illumination using a quarter-wave plate, reveals a clear energy dependent CPGE, increasing by as the photon energy approaches the Fermi energy. On top of this broad increase, there exists an energy resonance for the CPGE signal at ~0.6 eV. An underlying linear polarization-dependent photoresponse of the device from the photothermoelectric effect (PTE) is seen to decrease by an order of magnitude at lower energies. This PTE response has been measured in a broad energy range (0.3-1.8eV) using a linearly polarized light along two main crystal axes, and is in good agreement with DFT calculations.

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Presenters

  • Seyyedesadaf Pournia

    University Of Cincinnati

Authors

  • Seyyedesadaf Pournia

    University Of Cincinnati

  • Giriraj Jnawali

    University Of Cincinnati

  • Samuel M Linser

    University Of Cincinnati

  • Iraj Abbasian Shojaei

    University Of Cincinnati

  • Howard E Jackson

    University Of Cincinnati

  • Leigh Smith

    University Of Cincinnati

  • Congcong Le

    Max Planck Institute for Chemical Physics of Solids

  • Fu-Chun Zhang

    Kavli Institute of Theoretical Sciences, University of the Chinese Academy of Sciences, Kavli Institute of Theoretical Sciences, University of the Chinese Academy of Science

  • Brenden Ortiz

    University of California, Santa Barbara, Materials Department, UC Santa Barbara

  • Stephen D. Wilson

    Materials Department, UC Santa Barbara, Materials Department, University of California, Santa Barbara, California 93106-5050, USA, Materials, University of Santa Barbara, Materials Department, University of California, Santa Barbara